3 out of 3
How many 10-digit numbers containing only 1s, 2s and 3s can you write?
3 out of 3
Weekly Problem 11 - 2011
Kanga hops ten times in one of four directions. At how many different points can he end up?
1 out of 3
Time for a little mathemagic! Choose any five cards from a pack and show four of them to your partner. How can they work out the fifth?
1 out of 3
Given the products of diagonally opposite cells - can you complete this Sudoku?
2 out of 3
Can you solve the clues to find out who's who on the friendship graph?
2 out of 3
Can you recreate these designs? What are the basic units? What movement is required between each unit? Some elegant use of procedures will help - variables not essential.
2 out of 3
Just four procedures were used to produce a design. How was it done? Can you be systematic and elegant so that someone can follow your logic?
2 out of 3
The puzzle can be solved by finding the values of the unknown digits (all indicated by asterisks) in the squares of the $9\times9$ grid.
2 out of 3
Can you use your powers of logic and deduction to work out the missing information in these sporty situations?
2 out of 3
Weekly Problem 16 - 2016
How many three digit numbers have the property that the middle digit is the mean of the other two digits?
