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# Special 24

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### Cuisenaire Squares

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Age 7 to 11

Challenge Level

The number $24$ is special because it is just one short of being a square number.

So $24 + 1 = 25$ and $5^2 = 25$

AND when you double $24$ the answer is also one short of being a square

number.

So $24 \times 2 = 48$ and $48 + 1 = 49$ and $7^2 = 49$.

Find another number that is special in the same way as $24$.

These squares have been made from Cuisenaire rods. Can you describe the pattern? What would the next square look like?

Cut differently-sized square corners from a square piece of paper to make boxes without lids. Do they all have the same volume?