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problem

Three way mix up

5 to 11

Jack has nine tiles. He put them together to make a square so that two tiles of the same colour were not beside each other. Can you find another way to do it?

problem

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Reaction timer

11 to 14

This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

problem

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Caterpillars

5 to 7

These caterpillars have 16 parts. What different shapes do they make if each part lies in the small squares of a 4 by 4 square?

problem

Which numbers? (1)

7 to 11

I am thinking of three sets of numbers less than 101. They are the red set, the green set and the blue set. Can you find all the numbers in the sets from these clues?

article

Optimising input - maximising output

11 to 18

A group of teachers involved in embedding NRICH tasks into their everyday practice decided they needed to address the (im)balance between teacher and student activity in their classrooms. In this article they share the issues they identified and what they have been doing to address them.

article

Using non-standard problems to challenge pre-conceptions

This paper explores the value of using problems as a way of challenging children’s mathematical pre-conceptions and problems' potential for extending their knowledge and understanding. It considers some non-standard problems taken from the NRICH website and examines them in the light of children's solutions and what children have said, or implied, about their thinking.