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Use and rearrange formulas
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Learn it To make a different letter the subject, undo the operations around it in reverse order, doing the same to both sides.
Example: Make C the subject of $F = \frac{9}{5}C + 32$.
- Subtract 32: $F - 32 = \frac{9}{5}C$.
- Multiply by $\frac{5}{9}$: $C = \frac{5}{9}(F - 32)$.
- E.g. F = 50: $C = \frac{5}{9} \times 18 = 10$°C.
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