This four-part guide takes you through the basics of numeracy from arithmetic to algebra, with stops in between at fractions, decimals, geometry and statistics. ![]() If you wish to calculate the percentage increase or decrease of several numbers then we recommend using the first formula. Positive values indicate a percentage increase whereas negative values indicate percentage decrease. If your answer is a negative number, then this is a percentage increase. % Decrease = Decrease ÷ Original Number × 100 Then: divide the decrease by the original number and multiply the answer by 100. To calculate percentage decrease:įirst: work out the difference (decrease) between the two numbers you are comparing. If your answer is a negative number, then this is a percentage decrease. % increase = Increase ÷ Original Number × 100. Then: divide the increase by the original number and multiply the answer by 100. To calculate the percentage increase:įirst: work out the difference (increase) between the two numbers you are comparing. For more general percentage calculations see our page Percentage Calculators. ![]()
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