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40.9 °C = 105.62 °F

To convert Celsius to Fahrenheit simply multiply by 1.8 and then add 32

40.9 x 1.8 = 73.62

73.62 + 32 = 105.62

To convert F to C just subtract 32 and then divide by 1.8

32°F - 32 = 0 x 1.8 = 0oC

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*What you are more likely to see in a textbook is

F= 9/5 C + 32

C= 5/9 (F - 32)

The only difference is the fraction. Both sets of formulas give the same answer.

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Q: How do you convert 40.9 degrees Celsius to Fahrenheit?
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