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Grouping Goodies

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

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What Number?

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

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Odd Tic Tac

An odd version of tic tac toe

Even and Odd

Stage: 1 Challenge Level: Challenge Level:1

If you don't have any interlocking cubes, you could shade squares on squared paper in the same way as the pictures of coloured squares. You could then cut out your 'blocks' of squares and choose two to fit together.
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. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.