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### Neighbourly Addition

I added together some of my neighbours' house numbers. Can you explain the patterns I noticed?

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Neighbourly Addition

I added together some of my neighbours' house numbers. Can you explain the patterns I noticed?

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What Could It Be?

Favourite

In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?

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Play to 37

Favourite

In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.

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Sorting the Numbers

Favourite

Can you put the numbers in the correct place in this Carroll diagram?

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Square subtraction

Favourite

Look at what happens when you take a number, square it and subtract your answer. What kind of number do you get? Can you prove it?

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Take three numbers

Favourite

What happens when you add three numbers together? Will your answer be odd or even? How do you know?

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Odd times Even

Favourite

This problem looks at how one example of your choice can show something about the general structure of multiplication.

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Two numbers under the microscope

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This investigates one particular property of number by looking closely at an example of adding two odd numbers together.

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Magic Letters

Favourite

Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?