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### Number and algebra

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# Diagonal Trace

It might help to draw in all the diagonals first, then trace over them with a coloured pencil.

You could print off this sheet which has the shapes and the diagonals drawn for you.

Do you have some sort of system for trying to trace over the diagonals?

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### Prime Magic

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Age 7 to 11

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

It might help to draw in all the diagonals first, then trace over them with a coloured pencil.

You could print off this sheet which has the shapes and the diagonals drawn for you.

Do you have some sort of system for trying to trace over the diagonals?

Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?

How many different sets of numbers with at least four members can you find in the numbers in this box?