Problem
Teachers' Notes
Hint
Solution
Finding Fifteen
Ways to make 15 cards:
9, 6
8, 7
1, 2, 3, 4, 5
9, 5, 1
8, 7
6, 4, 3, 2
9, 4, 2
8, 7
6, 5, 3, 1
9, 1, 2, 3
8, 7
6, 5, 4
9, 6
8, 5, 2
7, 4, 3, 1
9, 6
8,3, 4
7, 5, 2, 1
9, 5, 1
8, 3, 4
7, 6, 2
9, 4, 2
8, 1, 6
7, 5, 3
9, 6
8, 4, 2, 1
7, 5, 3
Still to find: 942, 87, 1356