Addition and subtraction

In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.

Use your logical-thinking skills to deduce how much Dan's crisps and ice-cream cost altogether.

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

Imagine a very strange bank account where you are only allowed to do two things...

How could you arrange at least two dice in a stack so that the total of the visible spots is 18?

An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.