Explaining, convincing and proving

  • Perception versus reality
    problem
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    Perception Versus Reality

    Age
    14 to 18
    Challenge level
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    Infographics are a powerful way of communicating statistical information. Can you come up with your own?

  • Always Two
    problem
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    Always Two

    Age
    14 to 18
    Challenge level
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    Find all the triples of numbers a, b, c such that each one of them plus the product of the other two is always 2.

  • Trapezium made of wooden tangram pieces, including a square and a parallelogram.
    problem
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    Quad in Quad

    Age
    14 to 18
    Challenge level
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    Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?

  • Iff
    problem
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    Iff

    Age
    14 to 18
    Challenge level
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    Take a triangular number, multiply it by 8 and add 1. What is special about your answer? Can you prove it?

  • Negative 3 to the power of negative 3.
    problem
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    Negative Powers

    Age
    14 to 18
    Challenge level
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    What does this number mean? Which order of 1, 2, 3 and 4 makes the highest value? Which makes the lowest?

  • Back fitter
    problem
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    Back Fitter

    Age
    14 to 18
    Challenge level
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    10 graphs of experimental data are given. Can you use a spreadsheet to find algebraic graphs which match them closely, and thus discover the formulae most likely to govern the underlying processes?

  • Kite in a Square
    problem
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    Kite in a Square

    Age
    14 to 18
    Challenge level
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    Can you make sense of the three methods to work out what fraction of the total area is shaded?

  • Curve fitter
    problem
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    Curve Fitter

    Age
    14 to 18
    Challenge level
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    This problem challenges you to find cubic equations which satisfy different conditions.

  • Always Perfect
    problem
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    Always Perfect

    Age
    14 to 18
    Challenge level
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    Show that if you add 1 to the product of four consecutive numbers the answer is ALWAYS a perfect square.

  • Leonardo's Problem
    problem
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    Leonardo's Problem

    Age
    14 to 18
    Challenge level
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    A, B & C own a half, a third and a sixth of a coin collection. Each grab some coins, return some, then share equally what they had put back, finishing with their own share. How rich are they?