Addition and subtraction

  • Mathematical Ages
    problem

    Mathematical Ages

    Age
    11 to 14
    Challenge level
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    Arrange these three famous mathematicians in order with the shortest-lived first.

  • Bus Route
    problem

    Bus Route

    Age
    11 to 14
    Challenge level
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    How far apart are the first and last bus stops in this bus route?

  • Debasing the Coinage
    problem

    Debasing the Coinage

    Age
    11 to 14
    Challenge level
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    How much lighter will £5 worth of 5p's be with these new lighter coins?

  • Highs and Lows
    problem

    Highs and Lows

    Age
    11 to 14
    Challenge level
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    What were the maximum and minimum temperatures recorded in my max/min thermometer?

  • 3388
    problem

    3388

    Age
    11 to 14
    Challenge level
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    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.

  • Aba
    problem

    Aba

    Age
    11 to 14
    Challenge level
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    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.

  • Eleven
    problem

    Eleven

    Age
    11 to 14
    Challenge level
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    Replace each letter with a digit to make this addition correct.

  • Clocked
    problem

    Clocked

    Age
    11 to 14
    Challenge level
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    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?

  • Rolling Along the Trail
    problem

    Rolling Along the Trail

    Age
    11 to 14
    Challenge level
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    What could be the scores from five throws of this dice?

  • Football Sum
    problem

    Football Sum

    Age
    11 to 14
    Challenge level
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    Find the values of the nine letters in the sum: FOOT + BALL = GAME