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One Big Triangle
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One Big Triangle

5 to 7
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Make one big triangle so the numbers that touch on the small triangles add to 10.

Secondary CPD Follow-up
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Secondary CPD follow-up

Been to an NRICH Secondary CPD session? Here are some follow-up materials and recommended reading.

Anti-Magic Square
problem

Anti-magic Square

11 to 14
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You may have met Magic Squares, now meet an Anti-Magic Square. Its properties are slightly different - can you still solve it?
To Run or not to Run?
problem

To Run or Not to Run?

11 to 14
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If an athlete takes 10 minutes longer to walk, run and cycle three miles than he does to cycle all three miles, how long does it take him?
Eating Beans
problem

Eating Beans

11 to 14
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The Bean family are very particular about beans. At every meal all Beans eat some beans... At their last meal they ate 23 beans altogether. How many beans did Pa Bean eat?
Currency Exchange
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Currency Exchange

11 to 14
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Dan and Ann have 9 and 8 coins respectively. What is the smallest number of coins they must swap so they end up with equal amounts of money.
Four Cubes
problem

Four Cubes

14 to 16
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Four cubes are placed together to make a cuboid. What is the surface area of this cuboid?
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