Reverse percentages (Edexcel GCSE Maths): Flashcards

Original amount before % change

$100\% - \text{decrease}\%$, convert to decimal

$100\% + \text{increase}\%$, convert to decimal

$0.8$

$1.05$

$0.6$

$0.85$

$1.08$

$1.1$

Divide final amount by multiplier

Work forwards: original $\times$ multiplier = final

Identify if increase or decrease

Divide by 100 to get decimal