Addition and subtraction

problem

Sheep Talk

Age

7 to 11

Challenge level

In sheep talk the only letters used are B and A. A sequence of words is formed by following certain rules. What do you notice when you count the letters in each word?
problem

Homes

Age

5 to 7

Challenge level

Six new homes are being built! They can be detached, semi-detached or terraced houses. How many different combinations of these can you find?
problem

Fair Exchange

Age

5 to 7

Challenge level

In your bank, you have three types of coins. The number of spots shows how much they are worth. Can you choose coins to exchange with the groups given to make the same total?
problem

Planet Plex Time

Age

5 to 7

Challenge level

On Planet Plex, there are only 6 hours in the day. Can you answer these questions about how Arog the Alien spends his day?
problem

Money Line-Up

Age

5 to 7

Challenge level

In this game for two players, the aim is to make a row of four coins which total one dollar.
game

Shut the Box for Two

Age

5 to 7

Challenge level

Shut the Box game for an adult and child. Can you turn over the cards which match the numbers on the dice?
problem

Up and Down

Age

5 to 7

Challenge level

Sam got into an elevator. He went down five floors, up six floors, down seven floors, then got out on the second floor. On what floor did he get on?
problem

Big Dog, Little Dog

Age

5 to 7

Challenge level

Woof is a big dog. Yap is a little dog. Emma has 16 dog biscuits to give to the two dogs. She gave Woof 4 more biscuits than Yap. How many biscuits did each dog get?
problem

Starfish Spotting

Age

5 to 7

Challenge level

How many starfish could there be on the beach, and how many children, if I can see 28 arms?
problem

Domino Join Up

Age

5 to 7

Challenge level

Can you arrange fifteen dominoes so that all the touching domino pieces add to 6 and the ends join up? Can you make all the joins add to 7?