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How to Convert Fahrenheit to Celsius And Back

What is the equation to change Celsius to Fahrenheit and back?
A calculator helps here. To convert Fahrenheit to Celsius, subtract 32 degrees and divide by 1.8. To convert Celsius to Fahrenheit, multiply by 1.8 and add 32 degrees.

Di you know that -40 degrees is the same in Fahrenheit and Celsius?