Addition and subtraction

  • Subtraction Surprise
    problem
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    Subtraction Surprise

    Age
    7 to 14
    Challenge level
    1 out of 3

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

  • Countdown
    game
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    Countdown

    Age
    7 to 14
    Challenge level
    1 out of 3

    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
    1 out of 3

    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
    1 out of 3

    What can you discover about adding and subtracting sets of consecutive numbers?

  • Got It
    problem
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    Got It

    Age
    7 to 14
    Challenge level
    1 out of 3

    By choosing to add numbers from 1-4, can you hit the target number in this game?

  • 4 by 4 Mathdokus
    problem
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    4 by 4 Mathdokus

    Age
    7 to 14
    Challenge level
    1 out of 3

    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
    1 out of 3

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

  • Sealed Solution
    problem
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    Sealed Solution

    Age
    7 to 14
    Challenge level
    2 out of 3

    The sum of the numbers inside an envelope is written on the outside. What could the numbers be?

  • Diagonal Sums
    problem
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    Diagonal Sums

    Age
    7 to 14
    Challenge level
    2 out of 3

    In this 100 square, what is the sum of the numbers that are diagonally opposite each other?

  • problem
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    Three Neighbours

    Age
    7 to 14
    Challenge level
    2 out of 3

    Take three consecutive numbers and add them together. What do you notice?