you need to convert it to kelvin first then Fahrenheit
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There are two reasons for this. The first is that a Fahrenheit degree is smaller than a Celsius degree. Four Celsius degrees is the same size as nine Fahrenheit degrees. The second reason is that 32 degrees Fahrenheit is zero degrees Celsius. If you put those two ideas together you figure out that -40°F = -40°C.
To convert - you need to deduct 32 from the fahrenheit figure, then divide what's left by 1.8 - in this case you get -8.88888889
The formula to convert Celsius to Fahrenheit is:(Celsius x 1.8) + 32 = Fahrenheit
400 Fahrenheit = 204.4 Celsius 400 Celsius = 752 Fahrenheit
Fahrenheit = (Celsius * 1.8) + 32 Celsius = (Fahrenheit - 32) / 1.8