Conjecturing and generalising
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problemFix Me or Crush Me
Can you make matrices which will fix one lucky vector and crush another to zero?
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problemIrrational Arithmagons
Can you work out the irrational numbers that belong in the circles to make the multiplication arithmagon correct?
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problemRational Roots
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.
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problemCyclic Triangles
Make and prove a conjecture about the cyclic quadrilateral inscribed in a circle of radius r that has the maximum perimeter and the maximum area.
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problemFew and Far Between?
Can you find some Pythagorean Triples where the two smaller numbers differ by 1?
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problemInterpolating Polynomials
Given a set of points (x,y) with distinct x values, find a polynomial that goes through all of them, then prove some results about the existence and uniqueness of these polynomials.
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articleSum the Series
This article by Alex Goodwin, age 18 of Madras College, St Andrews describes how to find the sum of 1 + 22 + 333 + 4444 + ... to n terms. -
articleMaths Trails
The NRICH team are always looking for new ways to engage teachers and pupils in problem solving. Here we explain the thinking behind maths trails. -
pageFolding, Cutting and Punching
Exploring and predicting folding, cutting and punching holes and making spirals.