GCSE Maths (Edexcel)

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Reverse Percentage Change

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Ratio, Proportion and Rates of Change Ratio, Proportion and Rates of Change

Reverse Percentage Change

6:07 Percentage Change
Spec R9
Previous Percentage Decrease Next Direct Proportionality
  • A percentage increase or decrease can be found by multiplying the number by a certain fraction or decimal
  • To find a 50% increase, multiply the number by 1.5
  • To reverse the effect of a percentage increase, divide by the fraction or decimal
  • You cannot undo a percentage increase by doing the corresponding percentage decrease
  • Example: Cost of a meal after a 10% service charge is ��22, find the original cost. Convert percentages to fractions and divide by the fraction to find the original cost.
  • Example: Number of subscribers to a magazine decreases by 8%, given that there are 4,738 subscribers at the end of the year, calculate the number of subscribers at the start of the year. Convert percentages to decimals and divide by the decimal to find the original number of subscribers.

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