Addition and subtraction

  • Cunning Card Trick
    problem
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    Cunning Card Trick

    Age
    11 to 14
    Challenge level
    3 out of 3
    Delight your friends with this cunning trick! Can you explain how it works?
  • Always, Sometimes or Never? KS1
    problem
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    Always, Sometimes or Never? KS1

    Age
    5 to 7
    Challenge level
    1 out of 3

    Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?

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    Two Dice

    Age
    5 to 7
    Challenge level
    1 out of 3

    Find all the numbers that can be made by adding the dots on two dice.

  • One Big Triangle
    problem
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    One Big Triangle

    Age
    5 to 7
    Challenge level
    1 out of 3

    Make one big triangle so the numbers that touch on the small triangles add to 10.

  • Two flowers with the numbers 15 and 16 on them
    problem
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    Butterfly Flowers

    Age
    5 to 7
    Challenge level
    1 out of 3

    Can you find two butterflies to go on each flower so that the numbers on each pair of butterflies adds to the number on their flower?

  • What's in a Name?
    problem
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    What's in a Name?

    Age
    5 to 7
    Challenge level
    1 out of 3

    What do you notice about these squares of numbers? What is the same? What is different?

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    Robot Monsters

    Age
    5 to 7
    Challenge level
    1 out of 3

    Use these head, body and leg pieces to make Robot Monsters which are different heights.

  • Cuisenaire Counting
    problem
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    Cuisenaire Counting

    Age
    5 to 7
    Challenge level
    1 out of 3

    Here are some rods that are different colours. How could I make a yellow rod using white and red rods?

  • Number Balance
    problem
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    Number Balance

    Age
    5 to 7
    Challenge level
    1 out of 3

    Can you hang weights in the right place to make the the number balance balanced?

  • Domino Sorting
    problem
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    Domino Sorting

    Age
    5 to 7
    Challenge level
    1 out of 3

    Try grouping the dominoes in the ways described. Are there any left over each time? Can you explain why?