Mental calculations

  • 2, 4, 6, 8
    problem

    2, 4, 6, 8

    Age
    5 to 7
    Challenge level
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    Using the cards 2, 4, 6, 8, +, - and =, what number statements can you make?

  • Number Round Up
    problem

    Number round up

    Age
    5 to 7
    Challenge level
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    Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

  • problem

    The Brown family

    Age
    5 to 7
    Challenge level
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    Use the information about Sally and her brother to find out how many children there are in the Brown family.

  • The Tall Tower
    problem

    The tall tower

    Age
    5 to 7
    Challenge level
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    As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

  • I'm Eight
    problem

    I'm eight

    Age
    5 to 11
    Challenge level
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    Find a great variety of ways of asking questions which make 8.

  • Magnifying glass
    problem

    Number detective

    Age
    5 to 11
    Challenge level
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    Follow the clues to find the mystery number.

  • Strike it out
    problem

    Strike it out

    Age
    5 to 11
    Challenge level
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    Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

  • How do you see it?
    problem

    How do you see it?

    Age
    5 to 11
    Challenge level
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    Here are some short problems for you to try. Talk to your friends about how you work them out.

  • Ordering cards
    problem

    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.