How to Calculate Percentages Quickly and Accurately
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When you need a percentage, start by converting the percent to a decimal: just divide by 100. So 25% becomes 0.25, then multiply by the whole number. For 25% of 200, it's 200 times 0.25, which is 50. To reverse, like finding what percent 30 is of 150, divide 30 by 150 to get 0.2, then multiply by 100 to get 20%. Remember that 10% is easy to find—just move the decimal left once. From there, you can double or halve to get other percentages. Practicing these steps mentally will make calculations f…