Multiplication and division

problem
What is ziffle?

Age

7 to 11

Challenge level

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

Age

7 to 11

Challenge level

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
Zios and Zepts

Age

7 to 11

Challenge level

On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?
problem
Tom's number

Age

7 to 11

Challenge level

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

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

Age

7 to 11

Challenge level

The value of the circle changes in each of the following problems. Can you discover its value in each problem?
problem
Oranges and lemons

Age

7 to 11

Challenge level

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

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

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

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?