Pupils and students can submit solutions to the problems using the 'Submit a Solution' tab at the top of each problem. Solutions to the July problems will appear in September.
If you're a teacher, the Teachers' Notes accompanying each problem offer guidance on possible ways of engaging learners in the activity or challenge.
Follow us on Twitter @nrichmaths or visit our Facebook page for all the latest news from the NRICH team.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
On our website you will find thousands of our free mathematics enrichment materials (problems, articles and games) for teachers and learners from ages 5 to 19 years. All the resources are designed to develop subject knowledge, problem-solving and mathematical thinking skills. The website is updated with new material on the first day of every month. For guidance on how to find the right resources for you, go to the Help section of the site.