Powers and roots

  • Staircase
    problem

    Staircase

    Age
    16 to 18
    Challenge level
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    Solving the equation x^3 = 3 is easy but what about solving equations with a 'staircase' of powers?

  • Archimedes Numerical Roots
    problem

    Archimedes Numerical Roots

    Age
    16 to 18
    Challenge level
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    How did Archimedes calculate the lengths of the sides of the polygons which needed him to be able to calculate square roots?

  • Function Pyramids
    problem

    Function Pyramids

    Age
    16 to 18
    Challenge level
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    A function pyramid is a structure where each entry in the pyramid is determined by the two entries below it. Can you figure out how the pyramid is generated?

  • Square Pair Circles
    problem

    Square Pair Circles

    Age
    16 to 18
    Challenge level
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    Investigate the number of points with integer coordinates on circles with centres at the origin for which the square of the radius is a power of 5.

  • Golden Eggs
    problem

    Golden Eggs

    Age
    16 to 18
    Challenge level
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    Find a connection between the shape of a special ellipse and an infinite string of nested square roots.

  • Fibonacci Fashion
    problem

    Fibonacci Fashion

    Age
    16 to 18
    Challenge level
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    What have Fibonacci numbers to do with solutions of the quadratic equation x^2 - x - 1 = 0 ?

  • Pythagorean Fibs
    problem

    Pythagorean Fibs

    Age
    16 to 18
    Challenge level
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    What have Fibonacci numbers got to do with Pythagorean triples?

  • Irrational arithmagons
    problem

    Irrational Arithmagons

    Age
    16 to 18
    Challenge level
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    Can you work out the irrational numbers that belong in the circles to make the multiplication arithmagon correct?

  • Googol
    problem

    Googol

    Age
    16 to 18
    Challenge level
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    Find the smallest value for which a particular sequence is greater than a googol.

  • Rational Roots
    problem

    Rational Roots

    Age
    16 to 18
    Challenge level
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    Given that a, b and c are natural numbers show that if sqrt a+sqrt b is rational then it is a natural number. Extend this to 3 variables.