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Clever Carl
What would you do if your teacher asked you add all the numbers from 1 to 100? Find out how Carl Gauss responded when he was asked to do just that.
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Picture Your Method
7 to 11
Can you match these calculation methods to their visual representations?
problem
Favourite
The Add and Take-Away Path
5 to 7
Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?
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Clock Face
7 to 11
Where can you draw a line on a clock face so that the numbers on both sides have the same total?
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'tis Whole
14 to 18
Take a few whole numbers away from a triangle number. If you know the mean of the remaining numbers can you find the triangle number and which numbers were removed?
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Centred Squares
7 to 11
This challenge, written for the Young Mathematicians' Award, invites you to explore 'centred squares'.
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Sticky Triangles
7 to 11
Can you continue this pattern of triangles and begin to predict how many sticks are used for each new "layer"?
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Complex Puzzle
14 to 18
Can you use everything you have learned about complex numbers to crack this puzzle?