You may like to use our Cuisenaire rod environment for the problem below. Here is the environment (just scroll down for the problem itself):

FULL SCREEN VERSION

Here are three pairs of rods. The ratio of all the pairs is 3 : 2.

What is the ratio of the pair below?

Using only single rods what pair can you find with the same ratio as the pair below?

Using only pairs of single rods what pairs can you find with the same ratio as those below?

Using only pairs of single rods what pairs can you find with the ratio 9 : 6?