Percentages (OCR GCSE Maths): Flashcards

A fraction whose denominator is 100

$\frac{\text{Part}}{\text{Whole}} \times 100$

Multiply the fraction by 100

Divide by 100 and simplify

Divide the percentage by 100

Multiply the decimal by 100

Convert % to decimal/fraction, then multiply by amount

$\frac{\text{New} - \text{Old}}{\text{Old}} \times 100$

$\text{Original} \times (1 + \text{decimal})$

$\text{Original} \times (1 - \text{decimal})$

$P \times (1 + \frac{r}{100})^n$

$\frac{\text{Final}}{(1 \pm \text{decimal})}$