Mental Math For Pilots Practice Test

Which formula yields Fahrenheit from Celsius?

F = (Celsius + 32) x 9/5 F = Celsius x 2 + 32 F = (9/5 x Celsius) + 32 F = (Celsius - 32) x 5/9

Correct Answer:

F = (9/5 x Celsius) + 32

Explanation:

To convert Celsius to Fahrenheit you scale the temperature by 9/5 (which is 1.8) and then add 32 to account for the different zero points. The correct expression is Fahrenheit equals 9/5 times Celsius plus 32, or F = (9/5) × C + 32, often written as F = 1.8C + 32. The 32 is the Fahrenheit value at 0°C, so you first adjust the size of a degree, then shift the zero point. If you add 32 before multiplying, you’d effectively apply the offset to the scaled value as well, leading to an incorrect result. Using 2 as the multiplier is not accurate because a 1°C change equals 1.8°F, not 2°F. The form that uses (Celsius − 32) × 5/9 is the inverse direction (it converts Fahrenheit to Celsius) and doesn’t give Fahrenheit from Celsius.

Access more questions from this quiz

Continue to Mental Math for Pilots Practice Test for more practice questions and the full quiz experience.

Access More Questions