Reverse percentages (AQA GCSE Maths): Flashcards

Find original from final after % change

Decimals representing % changes

$\text{Original} = \frac{\text{Final}}{\text{Multiplier}}$

$(100\% - \text{percentage}) \div 100$

$(100\% + \text{percentage}) \div 100$

$0.8$

$1.05$

Divide final amount by multiplier

Work forwards: $\text{original} \times \text{multiplier} = \text{final}$

Clear working with multiplier