Mental calculations

  • Ordering cards
    problem
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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.

  • 4 Dom
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    4 Dom

    Age
    5 to 11
    Challenge level
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    Use these four dominoes to make a square that has the same number of dots on each side.

  • Build it up
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    Build It Up

    Age
    7 to 11
    Challenge level
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    Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

  • Buying a Balloon
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    Buying a Balloon

    Age
    7 to 11
    Challenge level
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    Lolla bought a balloon at the circus. She gave the clown six coins to pay for it. What could Lolla have paid for the balloon?

  • Highest and Lowest
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    Highest and Lowest

    Age
    7 to 11
    Challenge level
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    Put operations signs between the numbers 3, 4, 5 and 6 to make the highest possible number and lowest possible number.

  • Super Shapes
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    Super Shapes

    Age
    7 to 11
    Challenge level
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    The value of the circle changes in each of the following problems. Can you discover its value in each problem?

  • A Square of Numbers
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    A Square of Numbers

    Age
    7 to 11
    Challenge level
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    Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

  • Carrying Cards
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    Carrying Cards

    Age
    7 to 11
    Challenge level
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    These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?

  • Shape Times Shape
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    Shape Times Shape

    Age
    7 to 11
    Challenge level
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    These eleven shapes each stand for a different number. Can you use the number sentences to work out what they are?

  • Which symbol?
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    Which Symbol?

    Age
    7 to 11
    Challenge level
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    Choose a symbol to put into the number sentence.