Celsius to Fahrenheit Conversions

Temperature conversion questions are common. The standard formulas are:

• Fahrenheit to Celsius: $C = \frac{5}{9}(F - 32)$
• Celsius to Fahrenheit: $F = \frac{9}{5}C + 32$

A shortcut for Celsius to Fahrenheit:

1. Double the Celsius temperature.
2. Subtract 10% of this doubled number.
3. Add 32.

For 20°C: $20 \times 2 = 40 \rightarrow 40 - 4 = 36 \rightarrow 36 + 32 = 68°F$. It's also useful to memorize key points: 0°C = 32°F, 100°C = 212°F, and -40°C = -40°F.