°C * 1.8 + 32 = °F
(°F - 32) / 1.8 = °C
A quick way to do the C -> F conversion in your head is to double the number then subtract 10%, then add the 32.
Example:
15°C * 2 = 30
30 - 10% (3) = 27
27 + 32 = 59°F
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