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This activity is based on data in the book 'If the World Were a Village'. How will you represent your chosen data for maximum effect?

You have been given nine weights, one of which is slightly heavier than the rest. Can you work out which weight is heavier in just two weighings of the balance?

What is special about the difference between squares of numbers adjacent to multiples of three?

Ram divided 15 pennies among four small bags. He could then pay any sum of money from 1p to 15p without opening any bag. How many pennies did Ram put in each bag?

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