Choose any three by three square of dates on a calendar page...
Can you create a Latin Square from multiples of a six digit number?
Can you explain how this card trick works?
Al, Bertie, Chris and Di have sums of money totalling £150. Al and Bertie have £55 between them and Al and Chris have £65 between them. What is the difference between the amounts that Al and Di have?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.