Addition and subtraction

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

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

Can you match pairs of cards which show the same amount?

This problem challenges you to work out the number of cubes hidden under a cloth.

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Arrange the numbers 1 to 6 so that the sum of each side of the triangle equals the number in its centre.

Jack's mum used the same candles on his and his sister Kate's birthday cakes. When was Kate born?

On a farm there were some animals with 8 heads and 22 feet altogether. How many hens were there?

What do you notice about these squares of numbers? What is the same? What is different?

There are ladybirds with 7 spots or 4 spots in this garden. What numbers of total spots can you make?