Addition and subtraction

  • It was 2010!
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    It Was 2010!

    Age
    5 to 11
    Challenge level
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    If the answer's 2010, what could the question be?
  • Sitting round the party tables
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    Sitting Round the Party Tables

    Age
    5 to 11
    Challenge level
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    Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.

  • Dotty Six
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    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.

  • Dicey Addition
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    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.

  • Half Time
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    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?

  • Take three numbers
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    Take Three Numbers

    Age
    5 to 11
    Challenge level
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    What happens when you add three numbers together? Will your answer be odd or even? How do you know?

  • How do you see it?
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    How Do You See It?

    Age
    5 to 11
    Challenge level
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    Here are some short problems for you to try. Talk to your friends about how you work them out.

  • Ordering cards
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    Ordering Cards

    Age
    5 to 11
    Challenge level
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    This problem is designed to help children to learn, and to use, the two and three times tables.

  • Doing and undoing
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    Doing and Undoing

    Age
    5 to 11
    Challenge level
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    An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.

  • Digit Addition
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    Digit Addition

    Age
    5 to 11
    Challenge level
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    Try out this number trick. What happens with different starting numbers? What do you notice?