Halving and doubling

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At school my group, Earth, were doing doubling numbers and Mars group were doing halving.

[Daddy writes: This term, the groups in Pippy’s class are named after planets]

Your could add 4 and 4 – that makes 8.

To double a number, you have to add the same number twice.

If you have a number 6, you have to take away half of it – that is 3.

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