Addition and subtraction

problem
Ring of numbers

Age

5 to 7

Challenge level

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
article
Making sense of positives and negatives

This article suggests some ways of making sense of calculations involving positive and negative numbers.
game
Favourite

Up, down, flying around

Age

11 to 14

Challenge level

Play this game to learn about adding and subtracting positive and negative numbers
problem
Strange bank account

Age

11 to 14

Challenge level

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

Age

7 to 11

Challenge level

How could you arrange at least two dice in a stack so that the total of the visible spots is 18?
list
Current playing with number upper primary pupil

Age

7 to 11

All these activities have something to do with multiplying and dividing. Can you spot the connections?
list
More playing with number lower primary

Age

5 to 7

Some additional activities to develop children's understanding of addition and subtraction of number through playing with number.
list
Playing with numbers

Age

5 to 7

All these activities use adding and taking away. Can you spot the connections?
problem
Doing and undoing

Age

5 to 11

Challenge level

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

Age

5 to 11

Challenge level

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