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Prime Magic

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?

What Is Ziffle?

Can you work out what a ziffle is on the planet Zargon?

Shapes on the Playground

Sally and Ben were drawing shapes in chalk on the school playground. Can you work out what shapes each of them drew using the clues?

Transformations Tables

Age 7 to 11 Challenge Level:

This solution comes from Chris. Well done!

22 20 18 16 14
26 24 22 20 18
30 28 26 24 22
34 32 30 28 26
38 36 34 32 30

The diagonal is the same as +2, because it's the same as + 4 then - 2.

2 6 18 54 162
4 12 36 108 324
8 24 72 216 648
16 48 144 432 1296
32 96 288 864 2592

The diagonal is the same as x 6, because it's x 2 and then x 3.

Completed table of line segments
The diagonal is the same as halving the width and doubling the height at the same time.