Multiplication and division

problem

Sending Cards

Age

7 to 11

Challenge level

1 out of 3

This challenge asks you to investigate the total number of cards that would be sent if four children send one to all three others. How many would be sent if there were five children? Six?
problem

What's My Weight?

Age

7 to 11

Challenge level

1 out of 3

There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?
problem

What Is Ziffle?

Age

7 to 11

Challenge level

1 out of 3

Can you work out what a ziffle is on the planet Zargon?
problem

Clever Keys

Age

7 to 11

Challenge level

1 out of 3

On a calculator, make 15 by using only the 2 key and any of the four operations keys. How many ways can you find to do it?
problem

Tom's Number

Age

7 to 11

Challenge level

1 out of 3

Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.
problem

Watching the Wheels Go 'round and 'round

Age

7 to 11

Challenge level

1 out of 3

Use this information to work out whether the front or back wheel of this bicycle gets more wear and tear.
problem

Oranges and Lemons

Age

7 to 11

Challenge level

1 out of 3

On the table there is a pile of oranges and lemons that weighs exactly one kilogram. Using the information, can you work out how many lemons there are?
problem

Back to School

Age

7 to 11

Challenge level

1 out of 3

Mr. Sunshine tells the children they will have 2 hours of homework. After several calculations, Harry says he hasn't got time to do this homework. Can you see where his reasoning is wrong?
problem

Dividing a Cake

Age

7 to 11

Challenge level

1 out of 3

Annie cut this numbered cake into 3 pieces with 3 cuts so that the numbers on each piece added to the same total. Where were the cuts and what fraction of the whole cake was each piece?
problem

Penta Post

Age

7 to 11

Challenge level

1 out of 3

Here are the prices for 1st and 2nd class mail within the UK. You have an unlimited number of each of these stamps. Which stamps would you need to post a parcel weighing 825g?