Addition and subtraction

Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.

These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?

If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?

Use the 'double-3 down' dominoes to make a square so that each side has eight dots.

Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?

Annie and Ben are playing a game with a calculator. What was Annie's secret number?

Different combinations of the weights available allow you to make different totals. Which totals can you make?

There are nasty versions of this dice game but we'll start with the nice ones...

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?