You may also like

Calendar Capers

Choose any three by three square of dates on a calendar page...

Card Trick 2

Can you explain how this card trick works?

The Patent Solution

A combination mechanism for a safe comprises thirty-two tumblers numbered from one to thirty-two in such a way that the numbers in each wheel total 132... Could you open the safe?

Cross-country Race

Age 11 to 14 Challenge Level:

Eight children enter the autumn cross-country race at school.
How many possible ways could they come in at first, second and third places?

[copyright Microsoft]