Explaining, convincing and proving

  • Treasure Hunt
    problem
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    Treasure hunt

    Age
    7 to 14
    Challenge level
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    Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?

  • missing multipliers
    problem
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    Missing multipliers

    Age
    7 to 14
    Challenge level
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    What is the smallest number of answers you need to reveal in order to work out the missing headers?

  • The Number Jumbler
    problem
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    The Number Jumbler

    Age
    7 to 14
    Challenge level
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    The Number Jumbler can always work out your chosen symbol. Can you work out how?

  • Neighbourly Addition
    problem

    Neighbourly addition

    Age
    7 to 14
    Challenge level
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    I added together some of my neighbours' house numbers. Can you explain the patterns I noticed?

  • 3 by 3 Mathdokus
    problem

    3 by 3 Mathdokus

    Age
    7 to 14
    Challenge level
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    Can you use the clues to complete these 3 by 3 Mathematical Sudokus?

  • 4 by 4 Mathdokus
    problem
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    4 by 4 Mathdokus

    Age
    7 to 14
    Challenge level
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    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
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    In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.

  • Number Lines in Disguise
    problem
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    Number lines in disguise

    Age
    7 to 14
    Challenge level
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    Some of the numbers have fallen off Becky's number line. Can you figure out what they were?

  • problem

    Number sandwiches

    Age
    7 to 14
    Challenge level
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    Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?

  • Sealed Solution
    problem
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    Sealed solution

    Age
    7 to 14
    Challenge level
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    Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?