Copyright © University of Cambridge. All rights reserved.

Here is a grid which looks a little like spots on dice or dominoes:

This text is usually replaced by the Flash movie.

Full Screen Version

Can you see why 2 by 2 is 5?

What is 2 by 3? You may like to use the interactivity above to explore.

2 by 4?

2 by 5?

Can you predict what 2 by 10 will be? Explain how you know.

What is 3 by 2?

3 by 3?

3 by 4?

Predict what 3 by 10 will be and explain how you arrived at your solution.

How about 10 by 2?

10 by 3?

10 by 10?

2 by 4?

2 by 5?

Can you predict what 2 by 10 will be? Explain how you know.

What is 3 by 2?

3 by 3?

3 by 4?

Predict what 3 by 10 will be and explain how you arrived at your solution.

How about 10 by 2?

10 by 3?

10 by 10?