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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.
Even and Odd
Age 5 to 7
Challenge Level 
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.
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