Working systematically
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problemNegative Dice
If the odd numbers on two dice are made negative, which of the totals cannot be achieved?
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problemMultiply the Addition Square
If you take a three by three square on a 1-10 addition square and multiply the diagonally opposite numbers together, what is the difference between these products. Why?
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problemOranges and Lemons, Say the Bells of St Clement's
Bellringers have a special way to write down the patterns they ring. Learn about these patterns and draw some of your own.
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problemTriangular Clock
Trinni rearranges numbers on a clock face so each adjacent pair add up to a triangle number... What number did she put where 6 would usually be?
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problemMini Kakuro
The sum of each column and row in this grid give the totals as shown. What number goes in the starred square?