List

Year 10 Conjecturing and Generalising

Arithmagons
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Arithmagons

Age
11 to 16
Challenge level
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Can you find the values at the vertices when you know the values on the edges?

More Twisting and Turning
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More Twisting and Turning

Age
11 to 16
Challenge level
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It would be nice to have a strategy for disentangling any tangled ropes...
Take Three From Five
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Take Three From Five

Age
11 to 16
Challenge level
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Caroline and James pick sets of five numbers. Charlie tries to find three that add together to make a multiple of three. Can they stop him?

Differences
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Differences

Age
11 to 14
Challenge level
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Can you guarantee that, for any three numbers you choose, the product of their differences will always be an even number?
Speeding boats
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Speeding boats

Age
14 to 16
Challenge level
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Two boats travel up and down a lake. Can you picture where they will cross if you know how fast each boat is travelling?
circles in quadrilaterals
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Circles in quadrilaterals

Age
14 to 16
Challenge level
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Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.

A little light thinking
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A little light thinking

Age
14 to 16
Challenge level
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Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?

Which is cheaper?
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Favourite

Which is cheaper?

Age
14 to 16
Challenge level
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When I park my car in Mathstown, there are two car parks to choose from. Can you help me to decide which one to use?
Hollow Squares
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Favourite

Hollow Squares

Age
14 to 16
Challenge level
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Which armies can be arranged in hollow square fighting formations?
Pair Products
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Favourite

Pair Products

Age
14 to 16
Challenge level
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Choose four consecutive whole numbers. Multiply the first and last numbers together. Multiply the middle pair together. What do you notice?

For richer for poorer
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Favourite

For richer for poorer

Age
14 to 16
Challenge level
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Charlie has moved between countries and the average income of both has increased. How can this be so?
At right angles
problem
Favourite

At right angles

Age
14 to 16
Challenge level
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Can you decide whether two lines are perpendicular or not? Can you do this without drawing them?
Mystic Rose
problem
Favourite

Mystic Rose

Age
14 to 16
Challenge level
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Use the animation to help you work out how many lines are needed to draw mystic roses of different sizes.
Filling the gaps
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Favourite

Filling the gaps

Age
14 to 16
Challenge level
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Which numbers can we write as a sum of square numbers?
Plus Minus
problem
Favourite

Plus Minus

Age
14 to 16
Challenge level
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Can you explain the surprising results Jo found when she calculated the difference between square numbers?
Of all the areas
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Favourite

Of all the areas

Age
14 to 16
Challenge level
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Can you find a general rule for finding the areas of equilateral triangles drawn on an isometric grid?
Fair Shares?
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Fair Shares?

Age
14 to 16
Challenge level
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A mother wants to share a sum of money by giving each of her children in turn a lump sum plus a fraction of the remainder. How can she do this in order to share the money out equally?
What's Possible?
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What's Possible?

Age
14 to 16
Challenge level
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Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?
Attractive Tablecloths
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Attractive Tablecloths

Age
14 to 16
Challenge level
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Charlie likes tablecloths that use as many colours as possible, but insists that his tablecloths have some symmetry. Can you work out how many colours he needs for different tablecloth designs?
Pick's Theorem
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Pick's Theorem

Age
14 to 16
Challenge level
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Polygons drawn on square dotty paper have dots on their perimeter (p) and often internal (i) ones as well. Find a relationship between p, i and the area of the polygons.
Painted Cube
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Painted Cube

Age
14 to 16
Challenge level
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Imagine a large cube made from small red cubes being dropped into a pot of yellow paint. How many of the small cubes will have yellow paint on their faces?
Multiplication square
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Multiplication square

Age
14 to 16
Challenge level
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Pick a square within a multiplication square and add the numbers on each diagonal. What do you notice?
Perpendicular lines
problem
Favourite

Perpendicular lines

Age
14 to 16
Challenge level
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Position the lines so that they are perpendicular to each other. What can you say about the equations of perpendicular lines?
Harmonic Triangle
problem
Favourite

Harmonic Triangle

Age
14 to 16
Challenge level
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Can you see how to build a harmonic triangle? Can you work out the next two rows?