Addition and subtraction

problem

Sticky Dice

Age

7 to 11

Challenge level

Throughout these challenges, the touching faces of any adjacent dice must have the same number. Can you find a way of making the total on the top come to each number from 11 to 18 inclusive?
game

Sumo

Age

7 to 11

Challenge level

A number game requiring a strategy.
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

Mathdoku

Age

7 to 11

Challenge level

Complete the Mathdoku grid using the clues. Can you convince us that the number you have chosen for each square has to be correct?
problem

Five More Coins

Age

7 to 11

Challenge level

Could Ben have any amount of money between 5p and £2 in his pocket if he has five coins?
problem

Diagonal in a Spiral

Age

7 to 11

Challenge level

Investigate the totals you get when adding numbers in threes on the diagonal of this pattern.
problem

What Distance?

Age

7 to 11

Challenge level

Can you use addition and subtraction to answer these questions about real-life distances?
game

Asteroid Blast

Age

7 to 11

Challenge level

A game for 2 people. Use your skills of addition, subtraction, multiplication and division to blast the asteroids.
problem

Worms

Age

7 to 11

Challenge level

Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?
problem

Dice and Spinner Numbers

Age

7 to 11

Challenge level

If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?