Addition and subtraction

  • Four goodness sake
    problem
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    Four Goodness' Sake

    Age
    7 to 11
    Challenge level
    filled star filled star filled star

    Use 4 four times in a calculation. What answers can you get?

  • Dice in a Corner
    problem
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    Dice in a Corner

    Age
    7 to 11
    Challenge level
    filled star filled star filled star

    How could you arrange at least two dice in a stack so that the total of the visible spots is 18?

  • The Dice Train
    problem
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    The Dice Train

    Age
    7 to 11
    Challenge level
    filled star filled star filled star

    This dice train has been made using specific rules. How many different trains can you make?

  • Subtraction Surprise
    problem
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    Subtraction Surprise

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    Try out these calculations. Are you surprised by the results?

  • Countdown
    game
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    Countdown

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    Here is a chance to play a version of the classic Countdown Game.

  • Dicey Operations
    game
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    Dicey Operations

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    In these addition and subtraction games, you'll need to think strategically to get closest to the target.

  • Consecutive Numbers
    problem
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    Consecutive Numbers

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

  • Got It
    problem
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    Got It

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

  • 4 by 4 Mathdokus
    problem
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    4 by 4 Mathdokus

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    Can you use the clues to complete these 4 by 4 Mathematical Sudokus?

  • More Less is More
    problem
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    More Less Is More

    Age
    7 to 14
    Challenge level
    filled star empty star empty star

    In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.