Addition and subtraction

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?
problem

Numbered Cars

Age

7 to 11

Challenge level

2 out of 3

Can you crack my code and use it to find out what two car number plates add up to?
problem

All Seated

Age

7 to 11

Challenge level

2 out of 3

Look carefully at the numbers. What do you notice? Can you make another square using the numbers 1 to 16, that displays the same properties?
problem

A Numbered Route

Age

7 to 11

Challenge level

2 out of 3

Can you draw a continuous line through 16 numbers on this grid so that the total of the numbers you pass through is as high as possible?