Addition and subtraction

problem

Next Number

Age

7 to 11

Challenge level

2 out of 3

Find the next number in this pattern: 3, 7, 19, 55 ...
problem

Rocco's Race

Age

7 to 11

Challenge level

2 out of 3

Rocco ran in a 200 m race for his class. Use the information to find out how many runners there were in the race and what Rocco's finishing position was.
problem

Throw a 100

Age

7 to 11

Challenge level

2 out of 3

Can you score 100 by throwing rings on this board? Is there more than way to do it?
problem

A-Magical Number Maze

Age

7 to 11

Challenge level

2 out of 3

This magic square has operations written in it, to make it into a maze. Start wherever you like, go through every cell and go out a total of 15!
problem

Buckets of Thinking

Age

7 to 11

Challenge level

2 out of 3

There are three buckets each of which holds a maximum of 5 litres. Use the clues to work out how much liquid there is in each bucket.
problem

Sept03 Sept03 Sept03

Age

7 to 11

Challenge level

2 out of 3

This number has 903 digits. What is the sum of all 903 digits?
problem

The Number Crunching Machine

Age

7 to 11

Challenge level

2 out of 3

Put a number at the top of the machine and collect a number at the bottom. What do you get? Which numbers get back to themselves?
problem

Magic Triangle

Age

7 to 11

Challenge level

2 out of 3

Place the digits 1 to 9 into the circles so that each side of the triangle adds to the same total.
problem

Adding Plus

Age

7 to 11

Challenge level

2 out of 3

Can you put plus signs in so this is true? 1 2 3 4 5 6 7 8 9 = 99 How many ways can you do it?
problem

Cherries Come in Twos

Age

7 to 11

Challenge level

2 out of 3

Susie took cherries out of a bowl by following a certain pattern. How many cherries had there been in the bowl to start with if she was left with 14 single ones?