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Can you use the windows in the picture as a starting point?
What size window will you try next?  
How will you remember what you have found out so far?

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Your Number Is...

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

Diagonal Sums

In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?

Finding 3D Stacks

Can you find a way of counting the spheres in these arrangements?

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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