Inverse Operations, Estimating and Checking Answers

  • What was in the Box?
    problem
    Favourite

    What Was in the Box?

    Age
    5 to 7
    Challenge level

    This box does something to the numbers that go into it. What might be happening inside the box?

  • Secret Number
    problem
    Favourite

    Secret Number

    Age
    5 to 7
    Challenge level

    Annie and Ben are playing a game with a calculator. What was Annie's secret number?

  • Doing and undoing
    problem
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    Doing and Undoing

    Age
    5 to 11
    Challenge level

    This investigation involving the four operations looks at doing and undoing.

  • Four Go
    problem
    Favourite

    Four Go

    Age
    7 to 11
    Challenge level

    This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?

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