Addition and subtraction

What happens when you add three numbers together? Will your answer be odd or even? How do you know?

This problem is designed to help children to learn, and to use, the two and three times tables.

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

Ben has five coins in his pocket. How much money might he have?

There were cola bottles for 2p, mini eggs for 3p, marshmallow twists for 5p and lollipops for 7p in the sweet shop. What could each of the children buy with their money?

Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick ten numbers from the bags so that their total is 37?

Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

We can arrange dots in a similar way to the 5 on a dice and they usually sit quite well into a rectangular shape. How many altogether in this 3 by 5? What happens for other sizes?