Doubling and halving multiples of 5

More mental arithmetic, doubling and halving multiples of 5. Should be a whizz if you are good at doubling!

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Quick revision of multiplying by 10 and 100, including 5-digit answers.

Once times tables are known they can be put into use by multiplying two digit multiples of 10.

These questions can all be done ?in your head? but they also ask for explanations of how they were done.

How many different multiplications can be made from three digits?

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