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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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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?

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Count the Digits

In this investigation we are going to count the number of 1s, 2s, 3s etc in numbers. Can you predict what will happen?

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?