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Adding with the Abacus

Nowadays the calculator is very familiar to many of us. What did people do to save time working out more difficult problems before the calculator existed?

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Ip Dip

"Ip dip sky blue! Who's 'it'? It's you!" Where would you position yourself so that you are 'it' if there are two players? Three players ...?

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How Odd

This problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?

Jumping Squares

Stage: 1 Challenge Level: Challenge Level:2 Challenge Level:2
Where could you land next?
Which move might be better? Why?
Have you thought of jumping backwards?
How are you keeping count of your moves?