Addition and subtraction
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problemDebasing the Coinage
How much lighter will £5 worth of 5p's be with these new lighter coins?
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problemHighs and Lows
What were the maximum and minimum temperatures recorded in my max/min thermometer?
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problem3388
Using some or all of the operations of addition, subtraction, multiplication and division and using the digits 3, 3, 8 and 8 each once and only once make an expression equal to 24.
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problemAba
In the following sum the letters A, B, C, D, E and F stand for six distinct digits. Find all the ways of replacing the letters with digits so that the arithmetic is correct.
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problemClocked
Is it possible to rearrange the numbers 1,2......12 around a clock face in such a way that every two numbers in adjacent positions differ by any of 3, 4 or 5 hours?
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problemPair Sums
Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?