7581 /www/nrich/html/content/id/7581/ 5 2011-08-03T14:37:34 <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0"><p>The weekly problems are easy to state and fascinating to solve. The content is aimed at the lower secondary level, but will give a dose of mathematical stimulation to solvers of all ages.</p> <p> </p> <h3>Go to the <a href="http://nrich.maths.org/public/viewer.php?weekly=true">live weekly problem</a>.</h3> <p> </p> <p>Fancy a challenge? See the more advanced <a href="http://nrich.maths.org/6497">post-16 challenges</a>.</p> <p> </p> <p>Need more? Take a look at our archives of weekly problems, each with a link into a more substantial problem on a similar  theme.</p> <p> </p> <h3>2011</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/7148">Week 1, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/526&amp;part=">No Right Angle Here</a></li> <li><a href="http://nrich.maths.org/7149">Week 2, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5674&amp;part=">Matchless</a></li> <li><a href="http://nrich.maths.org/2405">Week 3, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4889">Warmsnug Double Glazing</a></li> <li><a href="http://nrich.maths.org/7151">Week 4, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/841&amp;part=">Approximating Pi</a></li> <li><a href="http://nrich.maths.org/7152">Week 5, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2661&amp;part=">Consecutive Seven</a></li> <li><a href="http://nrich.maths.org/7153">Week 6, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6401&amp;part=">Power Mad!</a></li> <li><a href="http://nrich.maths.org/7154">Week 7, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6903&amp;part=">Partially Painted Cube</a></li> <li><a href="http://nrich.maths.org/7155">Week 8, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6571&amp;part=">Sticky Numbers</a></li> <li><a href="http://nrich.maths.org/7157">Week 9, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5018&amp;part=">Intersection Sums Sudoku</a></li> <li><a href="http://nrich.maths.org/7158">Week 10, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/742&amp;part=">What&#39;s Possible?</a></li> <li><a href="http://nrich.maths.org/7159">Week 11, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5882&amp;part=">Conway&#39;s Chequerboard Army</a></li> <li><a href="http://nrich.maths.org/7160">Week 12, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/790">Iff</a></li> <li><a href="http://nrich.maths.org/7161">Week 13, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/742&amp;part=">What&#39;s Possible?</a></li> <li><a href="http://nrich.maths.org/7162">Week 14, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/642&amp;part=">Symmetricality</a></li> <li><a href="http://nrich.maths.org/7163">Week 15, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2312&amp;part=">Peaches Today, Peaches Tomorrow</a></li> <li><a href="http://nrich.maths.org/7164">Week 16, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/622&amp;part=">Trice</a></li> <li><a href="http://nrich.maths.org/7165">Week 17, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1783&amp;part=">Remainders</a></li> <li><a href="http://nrich.maths.org/7166">Week 18, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5526&amp;part=">Can You Explain Why?</a></li> <li><a href="http://nrich.maths.org/7167">Week 19, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6514&amp;part=">Four on the Road</a></li> <li><a href="http://nrich.maths.org/7168">Week 20, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2293&amp;part=">Tilted Squares</a></li> <li><a href="http://nrich.maths.org/7169">Week 21, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/529">Painting Cubes</a></li> <li><a href="http://nrich.maths.org/7173">Week 22, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5988&amp;part=">An Average Average Speed</a></li> <li><a href="http://nrich.maths.org/7174">Week 23, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/874&amp;part=">Remainder</a></li> <li><a href="http://nrich.maths.org/7175">Week 24, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1840&amp;part=">Reflecting Squarely</a></li> <li><a href="http://nrich.maths.org/7176">Week 25, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/621&amp;part=">Ewa&#39;s Eggs</a></li> <li><a href="http://nrich.maths.org/7177">Week 26, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7216">Your Number Was...</a></li> <li><a href="http://nrich.maths.org/7178">Week 27, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/794&amp;part=">One or Both</a></li> <li><a href="http://nrich.maths.org/7179">Week 28, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2031&amp;part=">Children at Large</a></li> <li><a href="http://nrich.maths.org/7180">Week 29, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1272&amp;part=">Got It</a></li> <li><a href="http://nrich.maths.org/7181">Week 30, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/637&amp;part=">Floored</a></li> <li><a href="http://nrich.maths.org/7182">Week 31, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1885&amp;part=">Make 37</a></li> <li><a href="http://nrich.maths.org/7183">Week 32, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/688&amp;part=">Times Right</a></li> <li><a href="http://nrich.maths.org/7186">Week 33, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1023">Eleven</a></li> <li><a href="http://nrich.maths.org/7187">Week 34, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1930&amp;part=">Sums of Squares</a></li> <li><a href="http://nrich.maths.org/7188">Week 35, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5468&amp;part=">Factors and Multiples Game</a></li> <li><a href="http://nrich.maths.org/2166">Week 36, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2161">An Unusual Shape</a></li> <li><a href="http://nrich.maths.org/2167">Week 37, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6468">Curvy Areas</a></li> <li><a href="http://nrich.maths.org/2168">Week 38, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6323">Partly Circles</a></li> <li><a href="http://nrich.maths.org/2169">Week 39, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/548">Compare Areas</a></li> <li><a href="http://nrich.maths.org/2206">Week 40, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2282">More Number Pyramids</a></li> <li><a href="http://nrich.maths.org/2207">Week 41, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5525">Triangle Numbers</a></li> <li><a href="http://nrich.maths.org/2208">Week 42, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1864">Cinema Problem</a></li> <li><a href="http://nrich.maths.org/2209">Week 43, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7446">Poison, Antidote, Water</a></li> <li><a href="http://nrich.maths.org/2210">Week 44, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/846">Prime Magic</a></li> <li><a href="http://nrich.maths.org/2215">Week 45, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1797">Folding</a></li> <li><a href="http://nrich.maths.org/2216">Week 46, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/708">Fair Shares</a></li> <li><a href="http://nrich.maths.org/2217">Week 47, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4832/index">Semi-Regular Tessellations</a></li> <li><a href="http://nrich.maths.org/2218">Week 48, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/847">Power Crazy</a></li> <li><a href="http://nrich.maths.org/2219">Week 49, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6708">Handshakes</a></li> <li><a href="http://nrich.maths.org/2344">Week 50, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2278">Pair Products</a></li> <li><a href="http://nrich.maths.org/2345">Week 51, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1163">Sissa&#39;s Reward</a></li> <li><a href="http://nrich.maths.org/2346">Week 52, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2925/index">Shapely Pairs</a></li> <li><a href="http://nrich.maths.org/2347">Week 53, 2011</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5865">First Connect Three</a></li> </ul> </div> <p> </p> <h3>2010</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/6755">Week 1, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1228">Instant Insanity</a></li> <li><a href="http://nrich.maths.org/6756">Week 2, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/933">Mind Reader</a></li> <li><a href="http://nrich.maths.org/6757">Week 3, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1283">100 Percent</a></li> <li><a href="http://nrich.maths.org/6758">Week 4, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2194">Smith and Jones</a></li> <li><a href="http://nrich.maths.org/6761">Week 5, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/486">Speedy Sidney</a></li> <li><a href="http://nrich.maths.org/6762">Week 6, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1172">Code Breaker</a></li> <li><a href="http://nrich.maths.org/6763">Week 7, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/278">Rudolff&#39;s Problem</a></li> <li><a href="http://nrich.maths.org/6764">Week 8, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2925">Shapely Pairs</a></li> <li><a href="http://nrich.maths.org/6766">Week 9, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2814">Sweeping Hands</a></li> <li><a href="http://nrich.maths.org/6767">Week 10, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/637">Floored</a></li> <li><a href="http://nrich.maths.org/6768">Week 11, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2192">Brailler</a></li> <li><a href="http://nrich.maths.org/6769">Week 12, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1118">Would you rather?</a></li> <li><a href="http://nrich.maths.org/6770">Week 13, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4834">Top Coach</a></li> <li><a href="http://nrich.maths.org/6771">Week 14, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/751">Slippy Numbers</a></li> <li><a href="http://nrich.maths.org/6772">Week 15, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/684">Writ Large</a></li> <li><a href="http://nrich.maths.org/6773">Week 16, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5546">Street Sequences</a></li> <li><a href="http://nrich.maths.org/6774">Week 17, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/845">Powerful Factorial</a></li> <li><a href="http://nrich.maths.org/6775">Week 18, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/787">Take Ten</a></li> <li><a href="http://nrich.maths.org/6780">Week 19, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/627">Coins on a plate</a></li> <li><a href="http://nrich.maths.org/6781">Week 20, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5480">Paper Folding - models of the Platonic Solids</a></li> <li><a href="http://nrich.maths.org/6784">Week 21, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1869">Konigsberg</a></li> <li><a href="http://nrich.maths.org/6785">Week 22, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2661">Consecutive Seven</a></li> <li><a href="http://nrich.maths.org/6786">Week 23, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1115">Put out the flags</a></li> <li><a href="http://nrich.maths.org/6787">Week 24, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/756">Cayley</a></li> <li><a href="http://nrich.maths.org/6789">Week 25, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/633">Not so little X</a></li> <li><a href="http://nrich.maths.org/6790">Week 26, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4793">Mixing Paints</a></li> <li><a href="http://nrich.maths.org/6792">Week 27, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2278">Pair Problems</a></li> <li><a href="http://nrich.maths.org/6791">Week 28, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/104">Pizza Portions</a></li> <li><a href="http://nrich.maths.org/6793">Week 29, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/617">Isosceles</a></li> <li><a href="http://nrich.maths.org/6794">Week 30, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2669">Stars</a></li> <li><a href="http://nrich.maths.org/6795">Week 31, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/958">Train Timetable</a></li> <li><a href="http://nrich.maths.org/6796">Week 32, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1853">Repetitiously</a></li> <li><a href="http://nrich.maths.org/6797">Week 33, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/995">Read this Page</a></li> <li><a href="http://nrich.maths.org/6798">Week 34, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/553">Square Pegs</a></li> <li><a href="http://nrich.maths.org/6799">Week 35, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/513">Happy Numbers</a></li> <li><a href="http://nrich.maths.org/6800">Week 36, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/562">Towers</a></li> <li><a href="http://nrich.maths.org/6801">Week 37, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/894">Cutting a Cube</a></li> <li><a href="http://nrich.maths.org/7132">Week 38, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1862">Fac-finding</a></li> <li><a href="http://nrich.maths.org/7133">Week 39, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1951">A Shade Crossed</a></li> <li><a href="http://nrich.maths.org/7134">Week 40, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6179">Colour islands sudoku</a></li> <li><a href="http://nrich.maths.org/7135">Week 41, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6310">Addition Equation Sudoku</a></li> <li><a href="http://nrich.maths.org/7136">Week 42, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/756">Cayley</a></li> <li><a href="http://nrich.maths.org/7137">Week 43, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6571">Sticky Numbers</a></li> <li><a href="http://nrich.maths.org/7138">Week 44, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4856">First Forward into Logo 7</a></li> <li><a href="http://nrich.maths.org/7139">Week 45, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2290">Seven Squares</a></li> <li><a href="http://nrich.maths.org/7140">Week 46, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/470">Magic W</a></li> <li><a href="http://nrich.maths.org/7141">Week 47, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/34">Chocolate</a></li> <li><a href="http://nrich.maths.org/7142">Week 48, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/669">Thirty Six Exactly</a></li> <li><a href="http://nrich.maths.org/7143">Week 49, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2020">Joh&#39;s Train is on time</a></li> <li><a href="http://nrich.maths.org/7145">Week 50, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6564">Countdown Fractions</a></li> <li><a href="http://nrich.maths.org/7146">Week 51, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/637">Floored</a></li> <li><a href="http://nrich.maths.org/7147">Week 52, 2010</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/537">Fibs</a></li> </ul> </div> <p> </p> <h3>2009</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/6223">Week 1, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6650">How much can we spend</a></li> <li><a href="http://nrich.maths.org/6228">Week 2, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6987">Attractive Rotations</a></li> <li><a href="http://nrich.maths.org/6232">Week 3, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/584">Compare areas</a></li> <li><a href="http://nrich.maths.org/6229">Week 4, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5483">Music to my eyes</a></li> <li><a href="http://nrich.maths.org/6235">Week 5, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1140">A Puzzling Cube</a></li> <li><a href="http://nrich.maths.org/6233">Week 6, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7306">Which solids can we make</a></li> <li><a href="http://nrich.maths.org/6234">Week 7, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/31">Consecutive Numbers</a></li> <li><a href="http://nrich.maths.org/6237">Week 8, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/741">Euromaths</a></li> <li><a href="http://nrich.maths.org/6236">Week 9, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6146">Bigger or Smaller</a></li> <li><a href="http://nrich.maths.org/6238">Week 10, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/186">Buying a balloon</a></li> <li><a href="http://nrich.maths.org/6239">Week 11, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1150">Two primes make one square</a></li> <li><a href="http://nrich.maths.org/6240">Week 12, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5608">Temperature</a></li> <li><a href="http://nrich.maths.org/6241">Week 13, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/845">Powerful Factorial</a></li> <li><a href="http://nrich.maths.org/6242">Week 14, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/918">Tree Tops</a></li> <li><a href="http://nrich.maths.org/6245">Week 15, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6345">Searching for Mean(ing)</a></li> <li><a href="http://nrich.maths.org/6244">Week 16, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1002">Wonky Watches</a></li> <li><a href="http://nrich.maths.org/6246">Week 17, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/691">How Old are the Children</a></li> <li><a href="http://nrich.maths.org/6247">Week 18, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2420">Orange Drink</a></li> <li><a href="http://nrich.maths.org/6249">Week 19, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5459">?on the wall</a></li> <li><a href="http://nrich.maths.org/6248">Week 20, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2384">An Unhappy End</a></li> <li><a href="http://nrich.maths.org/6250">Week 21, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/980">Watch the Clock</a></li> <li><a href="http://nrich.maths.org/6251">Week 22, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6448">Power Countdown</a></li> <li><a href="http://nrich.maths.org/6252">Week 23, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4838">Litov&#39;s Mean Value Theorem</a></li> <li><a href="http://nrich.maths.org/6253">Week 24, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/756">Cayley</a></li> <li><a href="http://nrich.maths.org/6255">Week 25, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1013">Make 100</a></li> <li><a href="http://nrich.maths.org/6266">Week 26, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6400">For Richer and Poorer</a></li> <li><a href="http://nrich.maths.org/6256">Week 27, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7283">Primeter Expressions</a></li> <li><a href="http://nrich.maths.org/6257">Week 28, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5893">The Legacy</a></li> <li><a href="http://nrich.maths.org/6259">Week 29, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5914">Advent Sudoku</a></li> <li><a href="http://nrich.maths.org/6258">Week 30, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4890">Areas of Parallelograms</a></li> <li><a href="http://nrich.maths.org/6260">Week 31, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/602">Differences</a></li> <li><a href="http://nrich.maths.org/6262">Week 32, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1840">Reflecting Squarely</a></li> <li><a href="http://nrich.maths.org/6263">Week 33, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1860">Terminology</a></li> <li><a href="http://nrich.maths.org/6264">Week 34, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5458">Mirror, Mirror?</a></li> <li><a href="http://nrich.maths.org/6265">Week 35, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2845">Subtended Angles</a></li> <li><a href="http://nrich.maths.org/6718">Week 36, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6267">M, M and M</a></li> <li><a href="http://nrich.maths.org/6736">Week 37, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/920">Chances Are</a></li> <li><a href="http://nrich.maths.org/6737">Week 38, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2086">Farey Sequences</a></li> <li><a href="http://nrich.maths.org/6738">Week 39, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5533">Sums of Pairs</a></li> <li><a href="http://nrich.maths.org/6739">Week 40, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/503">Square Areas</a></li> <li><a href="http://nrich.maths.org/6741">Week 41, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/643">Flagging</a></li> <li><a href="http://nrich.maths.org/6742">Week 42, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1981">5 on the Clock</a></li> <li><a href="http://nrich.maths.org/6743">Week 43, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/542">Kissing Triangles</a></li> <li><a href="http://nrich.maths.org/6744">Week 44, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6398">Can they be equal?</a></li> <li><a href="http://nrich.maths.org/6745">Week 45, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/754">Small Change</a></li> <li><a href="http://nrich.maths.org/6746">Week 46, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/143">Three Squares</a></li> <li><a href="http://nrich.maths.org/6747">Week 47, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/944">Why 8?</a></li> <li><a href="http://nrich.maths.org/6748">Week 48, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2648">The Money Maze</a></li> <li><a href="http://nrich.maths.org/6750">Week 49, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/786">Number Daisy</a></li> <li><a href="http://nrich.maths.org/6751">Week 50, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4889">Warmsnug Double Glazing</a></li> <li><a href="http://nrich.maths.org/6752">Week 51, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/985">Walk and Ride</a></li> <li><a href="http://nrich.maths.org/6753">Week 52, 2009</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2285">Number Tracks</a></li> </ul> </div> <p> </p> <h3>2008</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/5707">Week 1, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/514">Series sum</a></li> <li><a href="http://nrich.maths.org/5709">Week 2, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6323">Partly Circles</a></li> <li><a href="http://nrich.maths.org/5708">Week 3, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/84">Sweets in a Box</a></li> <li><a href="http://nrich.maths.org/5711">Week 4, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/700">Napkin</a></li> <li><a href="http://nrich.maths.org/5710">Week 5, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5635">Nicely Similar</a></li> <li><a href="http://nrich.maths.org/5712">Week 6, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6401">Power Mad</a></li> <li><a href="http://nrich.maths.org/5750">Week 7, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1103">Fractions in a Box</a></li> <li><a href="http://nrich.maths.org/5753">Week 8, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5869">Impossible Square</a></li> <li><a href="http://nrich.maths.org/5752">Week 9, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6345">Searching for Mean(ing)</a></li> <li><a href="http://nrich.maths.org/5754">Week 10, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6349">A Question of Scale</a></li> <li><a href="http://nrich.maths.org/5756">Week 11, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5533">Sums of Pairs</a></li> <li><a href="http://nrich.maths.org/5755">Week 12, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4794">Mixing More Paints</a></li> <li><a href="http://nrich.maths.org/5757">Week 13, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2847">Right Angles</a></li> <li><a href="http://nrich.maths.org/5759">Week 14, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1134">Multiplication Squares</a></li> <li><a href="http://nrich.maths.org/5758">Week 15, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7502">What&#39;s that Graph</a></li> <li><a href="http://nrich.maths.org/5760">Week 16, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/794">One or Both</a></li> <li><a href="http://nrich.maths.org/5762">Week 17, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5868">Consecutive Negative Numbers</a></li> <li><a href="http://nrich.maths.org/5761">Week 18, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/665">Sitting Pretty</a></li> <li><a href="http://nrich.maths.org/5763">Week 19, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5689">Walking around a Cube</a></li> <li><a href="http://nrich.maths.org/5768">Week 20, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1002">Wonky Watches</a></li> <li><a href="http://nrich.maths.org/5767">Week 21, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6019">All Variables Sudoku</a></li> <li><a href="http://nrich.maths.org/5765">Week 22, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/480">14 Divisors</a></li> <li><a href="http://nrich.maths.org/5770">Week 23, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/617">Isoceles</a></li> <li><a href="http://nrich.maths.org/5769">Week 24, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/309">Areas and Ratios</a></li> <li><a href="http://nrich.maths.org/5771">Week 25, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6903">Partially Painted Cube</a></li> <li><a href="http://nrich.maths.org/5774">Week 26, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4716">Harmonic Triangle</a></li> <li><a href="http://nrich.maths.org/5772">Week 27, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6018">LCM Sudoku</a></li> <li><a href="http://nrich.maths.org/5773">Week 28, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/250">Some of the parts</a></li> <li><a href="http://nrich.maths.org/2406">Week 29, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2664">Efficient Cutting</a></li> <li><a href="http://nrich.maths.org/6196">Week 30, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/632">Hand Swap</a></li> <li><a href="http://nrich.maths.org/6198">Week 31, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6471">Reflecting Lines</a></li> <li><a href="http://nrich.maths.org/6200">Week 32, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2305">Buses</a></li> <li><a href="http://nrich.maths.org/6199">Week 33, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1026">Pumpkin Pie Problem</a></li> <li><a href="http://nrich.maths.org/6209">Week 34, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1867">Pick&#39;s Theorem</a></li> <li><a href="http://nrich.maths.org/6201">Week 35, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6344">Which is Bigger</a></li> <li><a href="http://nrich.maths.org/6203">Week 36, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/642">Symmetricality</a></li> <li><a href="http://nrich.maths.org/6202">Week 37, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6870">Mixing Lemonade</a></li> <li><a href="http://nrich.maths.org/6204">Week 38, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6624">Cyclic Quadrilaterals</a></li> <li><a href="http://nrich.maths.org/6205">Week 39, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/590">On Time</a></li> <li><a href="http://nrich.maths.org/6207">Week 40, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6046">Thousands and Millions</a></li> <li><a href="http://nrich.maths.org/6206">Week 41, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/722">Strange Numbers</a></li> <li><a href="http://nrich.maths.org/6277">Week 42, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/470">Magic W</a></li> <li><a href="http://nrich.maths.org/6222">Week 43, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2289">Your Number Is...</a></li> <li><a href="http://nrich.maths.org/6211">Week 44, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6424">Maths Filler</a></li> <li><a href="http://nrich.maths.org/6212">Week 45, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/300">At a glance</a></li> <li><a href="http://nrich.maths.org/6213">Week 46, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4851">Steady Free Fall</a></li> <li><a href="http://nrich.maths.org/6215">Week 47, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5919">A First Product Sudoku</a></li> <li><a href="http://nrich.maths.org/6216">Week 48, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2162">Rollin&#39; Rollin&#39; Rollin&#39;</a></li> <li><a href="http://nrich.maths.org/6217">Week 49, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1056">Super Shapes</a></li> <li><a href="http://nrich.maths.org/6218">Week 50, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/825">Getting an Angle</a></li> <li><a href="http://nrich.maths.org/6219">Week 51, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5018">Intersection Sums Sudoku</a></li> <li><a href="http://nrich.maths.org/6220">Week 52, 2008</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/718">Do Unto Caesar</a></li> </ul> </div> <p> </p> <h3>2007</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/5008">Week 1, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1014">Flashing Lights</a></li> <li><a href="http://nrich.maths.org/5010">Week 2, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1008">Wag Worms</a></li> <li><a href="http://nrich.maths.org/5016">Week 3, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/309">Areas and Ratios</a></li> <li><a href="http://nrich.maths.org/5012">Week 4, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6164">Investigating the Dilution Series</a></li> <li><a href="http://nrich.maths.org/5014">Week 5, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1783">Remainders</a></li> <li><a href="http://nrich.maths.org/5009">Week 6, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5917">Coins</a></li> <li><a href="http://nrich.maths.org/5011">Week 7, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/794">One or Both</a></li> <li><a href="http://nrich.maths.org/5013">Week 8, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/34">Chocolate</a></li> <li><a href="http://nrich.maths.org/5015">Week 9, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1082">The Hair and the Tortoise</a></li> <li><a href="http://nrich.maths.org/5017">Week 10, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2034">Always Perfect</a></li> <li><a href="http://nrich.maths.org/5019">Week 11, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/866">Arclets</a></li> <li><a href="http://nrich.maths.org/5023">Week 12, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/77">Ice Cream</a></li> <li><a href="http://nrich.maths.org/5020">Week 13, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/708">Fair Shares</a></li> <li><a href="http://nrich.maths.org/5026">Week 14, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/416">Look Before You Leap</a></li> <li><a href="http://nrich.maths.org/5021">Week 15, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/643">Flagging</a></li> <li><a href="http://nrich.maths.org/5022">Week 16, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7035">Light the Lights Again</a></li> <li><a href="http://nrich.maths.org/5027">Week 17, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/742">What&#39;s Possible</a></li> <li><a href="http://nrich.maths.org/5028">Week 18, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/803">Pent</a></li> <li><a href="http://nrich.maths.org/5030">Week 19, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/537">Fibs</a></li> <li><a href="http://nrich.maths.org/5031">Week 20, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/756">Cayley</a></li> <li><a href="http://nrich.maths.org/5024">Week 21, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/278">Rudolff&#39;s Problem</a></li> <li><a href="http://nrich.maths.org/5025">Week 22, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2658">Where to Land</a></li> <li><a href="http://nrich.maths.org/5667">Week 23, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6923">Growing Rectangles</a></li> <li><a href="http://nrich.maths.org/5668">Week 24, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4793">Mixing Paints</a></li> <li><a href="http://nrich.maths.org/5669">Week 25, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5909">The Square Hole</a></li> <li><a href="http://nrich.maths.org/5670">Week 26, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/498">Diving the Field</a></li> <li><a href="http://nrich.maths.org/5680">Week 27, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4911">Brush Loads</a></li> <li><a href="http://nrich.maths.org/5682">Week 28, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6046">Thousands and Millions</a></li> <li><a href="http://nrich.maths.org/5683">Week 29, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6254">Tangram</a></li> <li><a href="http://nrich.maths.org/5684">Week 30, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2274">Picturing Triangular Numbers</a></li> <li><a href="http://nrich.maths.org/5686">Week 31, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/658">Plus Minus</a></li> <li><a href="http://nrich.maths.org/5685">Week 32, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2163">Circle-In</a></li> <li><a href="http://nrich.maths.org/5687">Week 33, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6700">Diminishing Returns</a></li> <li><a href="http://nrich.maths.org/5688">Week 34, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5725">Diamond Collector</a></li> <li><a href="http://nrich.maths.org/5689">Week 35, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/289">Ladder and Cube</a></li> <li><a href="http://nrich.maths.org/5690">Week 36, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7385">Fit for Photocopying</a></li> <li><a href="http://nrich.maths.org/5691">Week 37, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6267">M, M and M</a></li> <li><a href="http://nrich.maths.org/5692">Week 38, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/360">Qqq?cubed</a></li> <li><a href="http://nrich.maths.org/5694">Week 39, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/645">One and Three</a></li> <li><a href="http://nrich.maths.org/5696">Week 40, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2194">Smith and Jones</a></li> <li><a href="http://nrich.maths.org/5693">Week 41, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/520">Time of Birth</a></li> <li><a href="http://nrich.maths.org/5695">Week 42, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/553">Square Pegs</a></li> <li><a href="http://nrich.maths.org/5697">Week 43, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1173">Egyptian Fractions</a></li> <li><a href="http://nrich.maths.org/5699">Week 44, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1159">Take the Right Angle</a></li> <li><a href="http://nrich.maths.org/5698">Week 45, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6903">Partially Painted Cubes</a></li> <li><a href="http://nrich.maths.org/5700">Week 46, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5636">Dating Made Easier</a></li> <li><a href="http://nrich.maths.org/5701">Week 47, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1045">Numerically Equal</a></li> <li><a href="http://nrich.maths.org/5702">Week 48, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6541">The Greedy Algorithm</a></li> <li><a href="http://nrich.maths.org/5703">Week 49, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1885">Make 37</a></li> <li><a href="http://nrich.maths.org/5704">Week 50, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/604">Circle Packing</a></li> <li><a href="http://nrich.maths.org/5705">Week 51, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1163">Sissa&#39;s Reward</a></li> <li><a href="http://nrich.maths.org/5706">Week 52, 2007</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/795">Hex</a></li> </ul> </div> <p> </p> <h3>2006</h3> <div class="toggle"> <ul> <li><a href="http://nrich.maths.org/4729">Week 1, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6536">Circles in quadrilaterals</a></li> <li><a href="http://nrich.maths.org/4730">Week 2, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1031">Pies</a></li> <li><a href="http://nrich.maths.org/4731">Week 3, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7500">Place your orders</a></li> <li><a href="http://nrich.maths.org/4736">Week 4, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5888">Cola Can</a></li> <li><a href="http://nrich.maths.org/4737">Week 5, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2163">Circle-in</a></li> <li><a href="http://nrich.maths.org/4738">Week 6, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/737">Beelines</a></li> <li><a href="http://nrich.maths.org/4739">Week 7, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/780">Bull&#39;s eye</a></li> <li><a href="http://nrich.maths.org/4740">Week 8, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5501">Equal Temperament</a></li> <li><a href="http://nrich.maths.org/4741">Week 9, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4890">Areas of Parallelograms</a></li> <li><a href="http://nrich.maths.org/4742">Week 10, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/980">Watch the Clock</a></li> <li><a href="http://nrich.maths.org/4743">Week 11, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5988">An average average speed</a></li> <li><a href="http://nrich.maths.org/4744">Week 12, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6494">Speeding Boats</a></li> <li><a href="http://nrich.maths.org/4875">Week 13, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7359">Track Design</a></li> <li><a href="http://nrich.maths.org/4876">Week 14, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4794">Mixing More Paints</a></li> <li><a href="http://nrich.maths.org/4877">Week 15, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/4960">Trapezium Four</a></li> <li><a href="http://nrich.maths.org/4879">Week 16, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6924">Table Patterns Go Wild!</a></li> <li><a href="http://nrich.maths.org/4880">Week 17, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1083">Augustus&#39; Age</a></li> <li><a href="http://nrich.maths.org/4882">Week 18, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/437">Diagonals for Area</a></li> <li><a href="http://nrich.maths.org/4881">Week 19, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/554">Semi-Circles</a></li> <li><a href="http://nrich.maths.org/4883">Week 20, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2343">Building Blocks</a></li> <li><a href="http://nrich.maths.org/4884">Week 21, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/823">Poly-Puzzle</a></li> <li><a href="http://nrich.maths.org/4885">Week 22, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2160">Inscribed in a Circle</a></li> <li><a href="http://nrich.maths.org/4946">Week 23, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1026">Pumpkin Pie Problem</a></li> <li><a href="http://nrich.maths.org/4947">Week 24, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1172">Code Breaker</a></li> <li><a href="http://nrich.maths.org/4948">Week 25, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/84">Sweets in a box</a></li> <li><a href="http://nrich.maths.org/4950">Week 26, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1813">Transformations on a pegboard</a></li> <li><a href="http://nrich.maths.org/4951">Week 27, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5714">Shape Times Shape</a></li> <li><a href="http://nrich.maths.org/4952">Week 28, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2663">Fence It</a></li> <li><a href="http://nrich.maths.org/4953">Week 29, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1887">A Square deal</a></li> <li><a href="http://nrich.maths.org/4954">Week 30, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2162">Rollin Rollin Rollin</a></li> <li><a href="http://nrich.maths.org/4955">Week 31, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6903">Partially Painted Cube</a></li> <li><a href="http://nrich.maths.org/4983">Week 32, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6448">Power Countdown</a></li> <li><a href="http://nrich.maths.org/4984">Week 33, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1883">Adding Triangles</a></li> <li><a href="http://nrich.maths.org/4988">Week 34, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2289">Your number is...</a></li> <li><a href="http://nrich.maths.org/4989">Week 35, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/480">14 Divisors</a></li> <li><a href="http://nrich.maths.org/4985">Week 36, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5531">Spaces for Exploration</a></li> <li><a href="http://nrich.maths.org/4990">Week 37, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/559">Dozens</a></li> <li><a href="http://nrich.maths.org/4991">Week 38, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/223">The Puzzling Sweetshop</a></li> <li><a href="http://nrich.maths.org/4992">Week 39, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7244">Winning the Lottery</a></li> <li><a href="http://nrich.maths.org/4993">Week 40, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1116">Money Bags</a></li> <li><a href="http://nrich.maths.org/4986">Week 41, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5917">Coins</a></li> <li><a href="http://nrich.maths.org/4987">Week 42, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2095">Traingles and Petals</a></li> <li><a href="http://nrich.maths.org/4994">Week 43, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/309">Areas and Ratios</a></li> <li><a href="http://nrich.maths.org/4995">Week 44, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6261">Crossed Ends</a></li> <li><a href="http://nrich.maths.org/4996">Week 45, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2281">Number Pyramids</a></li> <li><a href="http://nrich.maths.org/4997">Week 46, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/7024">Charlie&#39;s Delightful Machine</a></li> <li><a href="http://nrich.maths.org/4998">Week 47, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/6605">Nice and Nasty</a></li> <li><a href="http://nrich.maths.org/4999">Week 48, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/733">Millennium Man</a></li> <li><a href="http://nrich.maths.org/8679">Week 49, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2149">The Pi are Square</a></li> <li><a href="http://nrich.maths.org/5001">Week 50, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/1169">Buckets of Thinking</a></li> <li><a href="http://nrich.maths.org/5002">Week 51, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/2274">Picturing Triangle Numbers</a></li> <li><a href="http://nrich.maths.org/5003">Week 52, 2006</a>; see also the follow-up NRICH task <a href="http://nrich.maths.org/5666">Eight Ratios</a></li> </ul> </div> <p><br></br>  </p></mdoxml> <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0"> <a href="/content/id/7581/Weekly%20Problems3%20-%20final.xlsx">Here</a> is Rosie's and Zoe's spreadsheet with the information about all the problems. The year is the year that the problem appeared in UKMT Maths Challenge (I think!).<br></br> </mdoxml> 2 4 0 0 1 1 0 Weekly problems Hundreds of weekly problems for your enjoyment