Write the number down on a piece of paper, then add a zero at the right-hand end.
So 243 x 10 = 2430 without any brainwork.
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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.
10% = .10 (decimal equivilant) 10% can not be changed into a whole number unless you multiply by 10 or greater.
0.5 X 10 = 5
Take the number you have out of the whole, then dived it by the whole number. Multiply the resulting number by 100 and that's your percent.Example:What percentage is 7 of 10?7 / 10= .7.7 x 100 = 707 is 70% of 10.
You multiply the whole number as many times as the exponent is.