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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?


Age 7 to 11
Challenge Level

Try with a few different amounts of money for the two children. Does this help you to solve the problem?

What is the least the chocolate bar could be?

How much does this mean each child would have?

Are there any more answers and how do you know?