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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
Can you complete these grids?
5 by 5 grid. Top row: 22, 20, 18... Left column: 22, 26, 30...
explanation: subtract 2 left to right, add four top to bottom
5 by 5 grid. Top row: 2, 6, 18... Left column: 2, 4, 8...
explanation: Multiply by 3 left to right. Multiply by 2 top to bottom
4 by 4 grid. Top row rectangles' width halving from left to right. Top to bottom reactangles' height doubling