You may also like

problem icon

Cubes

Investigate the number of faces you can see when you arrange three cubes in different ways.

problem icon

I'm Eight

Find a great variety of ways of asking questions which make 8.

problem icon

Let's Investigate Triangles

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?

Number Balance

Stage: 1 Challenge Level: Challenge Level:2 Challenge Level:2

Full Screen Version
If you can see this message Flash may not be working in your browser
Please see http://nrich.maths.org/techhelp/#flash to enable it.

This is a number balance.

number balance
It is also called a 'balance bar' or an 'equaliser'. It has weights:
weights
These are hung below the numbers. It balances equal numbers, for example like this:
balancing 10 on one side with 2 and 8 on the other
Where would you need to hang the weight to make the one below balance?
9=3+4+?
What about this one?
9+4=6+?
If you had to use two weights and make the one below balance, where could you put them?
9 and 6 on one side, 10 and 4 on the other
How many different ways can you make it balance with two weights?
You may like to use the interactivity above to explore the problem.