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Apart from using a calculator, specifically if you multiply a whole number by a power of 10:* To multiply a whole number by 10, add a zero to the whole number. * To multiply a whole number by 100, add two zeros to the whole number. * Etc.
Using a calculator will make it easier
You multiply the number together - using a calculator if needed.
The quickest way is to multiply the original number by 0.9
Multiply the number by itself.