Addition and subtraction

Skippy and Anna are locked in a room in a large castle. The key to that room, and all the other rooms, is a number. The numbers are locked away in a problem. Can you help them to get out?

What could the half time scores have been in these Olympic hockey matches?

Try entering different sets of numbers in the number pyramids. How does the total at the top change?

Who said that adding couldn't be fun?

How many ways can you find to put in operation signs (+, −, ×, ÷) to make 100?

Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!

This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?

Dotty Six is a simple dice game that you can adapt in many ways.

Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.

Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?