Your Post-16 Solutions

Clock Arithmetic

Age 11 to 18
Challenge Level

What happens if we change the rules and make the usual straight number line into a circle?

Clock Squares

Age 14 to 18
Challenge Level

Can you find a way of predicting the value of large square numbers with the help of our power modulo calculator?

More Adventures with Modular Arithmetic

Age 14 to 18
Challenge Level

Investigate what happens when we add or multiply numbers using modular arithmetic.

Last Biscuit

Age 11 to 18
Challenge Level

Can you find a strategy that ensures you get to take the last biscuit in this game?

Crossing the Bridge

Age 11 to 18
Challenge Level

Four friends must cross a bridge. How can they all cross it in just 17 minutes?