Explaining, convincing and proving

  • Curvy areas
    problem
    Favourite

    Curvy Areas

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Have a go at creating these images based on circles. What do you notice about the areas of the different sections?

  • circles in quadrilaterals
    problem
    Favourite

    Circles in Quadrilaterals

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.

  • A little light thinking
    problem
    Favourite

    A Little Light Thinking

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?

  • Last one standing
    problem
    Favourite

    Last One Standing

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Imagine a room full of people who keep flipping coins until they get a tail. Will anyone get six heads in a row?

  • Finding factors
    problem
    Favourite

    Finding Factors

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Can you find the hidden factors which multiply together to produce each quadratic expression?

  • Generating Triples
    problem
    Favourite

    Generating Triples

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Sets of integers like 3, 4, 5 are called Pythagorean Triples, because they could be the lengths of the sides of a right-angled triangle. Can you find any more?

  • problem
    Favourite

    Who's the Winner?

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    When two closely matched teams play each other, what is the most likely result?

  • Double Trouble
    problem
    Favourite

    Double Trouble

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Simple additions can lead to intriguing results...

  • Factorising with Multilink
    problem
    Favourite

    Factorising With Multilink

    Age
    14 to 16
    Challenge level
    filled star empty star empty star

    Can you find out what is special about the dimensions of rectangles you can make with squares, sticks and units?