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'Domino Numbers' printed from

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