You may also like

problem icon

Calendar Capers

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

problem icon

Card Trick 2

Can you explain how this card trick works?

problem icon

Happy Numbers

Take any whole number between 1 and 999, add the squares of the digits to get a new number. Make some conjectures about what happens in general.

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]