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'Cuisenaire Counting' printed from http://nrich.maths.org/

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I have some rods that are different colours and different lengths.

I could make a yellow rod using white and red rods in many different ways. Here are some of them:

 

Can you find all the ways to match the yellow rod using reds and whites?

How will you know that you haven't missed any out?

You could use the interactivity below to try out your ideas, or you could use our Cuisenaire Environment.

 
Full screen version
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The dark green rod is longer than the yellow rod.
Can you find all the ways of matching the dark green rod using white and red rods?
How will you know that you have found them all?
 

Why not use the interactivity below to find all the ways of matching the dark green rod, or again, you could use our Cuisenaire Environment.


Full screen version

This text is usually replaced by the Flash movie.