Addition and subtraction

  • Half Time
    problem

    Half time

    Age
    5 to 11
    Challenge level
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    What could the half time scores have been in these Olympic hockey matches?

  • Number Pyramids
    problem

    Number pyramids

    Age
    11 to 14
    Challenge level
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    Try entering different sets of numbers in the number pyramids. How does the total at the top change?

  • Twenty20
    game

    Twenty20

    Age
    7 to 16
    Challenge level
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    Fancy a game of cricket? Here is a mathematical version you can play indoors without breaking any windows.
  • Dicey Addition
    problem

    Dicey addition

    Age
    5 to 11
    Challenge level
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    In these addition games, you'll need to think strategically to get closest to the target.

  • Can you Make 100?
    problem

    Can you make 100?

    Age
    11 to 14
    Challenge level
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    How many ways can you find to put in operation signs (+, −, ×, ÷) to make 100?

  • problem

    This Pied Piper of Hamelin

    Age
    7 to 11
    Challenge level
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    Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!

  • What was in the Box?
    problem

    What was in the box?

    Age
    5 to 7
    Challenge level
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    This box does something to the numbers that go into it. If you know the numbers that come out, what might be going on inside the box?

  • Dotty Six
    problem

    Dotty six

    Age
    5 to 11
    Challenge level
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    Dotty Six is a simple dice game that you can adapt in many ways.

  • Journeys in Numberland
    problem

    Journeys in Numberland

    Age
    7 to 11
    Challenge level
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    Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.

  • The add and take-away path
    problem

    The add and take-away path

    Age
    5 to 7
    Challenge level
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    Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?