Exploring and noticing

  • Polygon Rings
    problem
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    Polygon Rings

    Age
    11 to 14
    Challenge level
    filled star empty star empty star

    Join pentagons together edge to edge. Will they form a ring?

  • Star Polygons
    problem
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    Star Polygons

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    Draw some stars and measure the angles at their points. Can you find and prove a result about their sum?

  • Think of Two Numbers
    problem
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    Think of Two Numbers

    Age
    11 to 14
    Challenge level
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    Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?

  • Farey Sequences
    problem
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    Farey Sequences

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    There are lots of ideas to explore in these sequences of ordered fractions.

  • Shear Magic
    problem
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    Shear Magic

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    Explore the area of families of parallelograms and triangles. Can you find rules to work out the areas?

  • On the Edge
    problem
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    On the Edge

    Age
    11 to 14
    Challenge level
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    If you move the tiles around, can you make squares with different coloured edges?

  • Sending a Parcel
    problem
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    Sending a Parcel

    Age
    11 to 14
    Challenge level
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    What is the greatest volume you can get for a rectangular (cuboid) parcel if the maximum combined length and girth are 2 metres?

  • Square coordinates
    problem
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    Square Coordinates

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    A tilted square is a square with no horizontal sides. Can you devise a general instruction for the construction of a square when you are given just one of its sides?

  • Stars
    problem
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    Stars

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    Can you work out what step size to take to ensure you visit all the dots on the circle?

  • Subtended angles
    problem
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    Subtended Angles

    Age
    11 to 14
    Challenge level
    filled star filled star empty star

    What is the relationship between the angle at the centre and the angles at the circumference, for angles which stand on the same arc? Can you prove it?