Addition and subtraction

problem
Equivalent pairs

Age

5 to 7

Challenge level

Can you match pairs of cards which show the same amount?
article
Getting the balance right

In this article for primary teachers, Ems shares some common misconceptions surrounding the equals sign, and suggests ways to help learners develop their understanding.
interactivity
Interactive balance

Age

5 to 11

Challenge level

In this simulation of a balance, you can drag numbers and parts of number sentences on to the trays. Have a play!
problem
True or false?

Age

7 to 11

Challenge level

Without doing lots of calculations, can you decide which of these number sentences are true? How do you know?
problem
Sweetie box

Age

5 to 11

Challenge level

Max and Bryony both have a box of sweets. What do you know about the number of sweets they each have?
problem
Arranging additions and sorting subtractions

Age

5 to 7

Challenge level

Order these four calculations from easiest to hardest. How did you decide?
problem
Subtraction slip

Age

5 to 7

Challenge level

Can you spot the mistake in this video? How would you work out the answer to this calculation?
problem
Fruity pairs

Age

5 to 7

Challenge level

Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?
article
Let's get flexible!

In this article for primary teachers, Ems outlines how we can encourage learners to be flexible in their approach to calculation, and why this is crucial.
problem
Football sum

Age

11 to 14

Challenge level

Find the values of the nine letters in the sum: FOOT + BALL = GAME