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Here is a way from C to F that is easy to do in your head;

Say you see 28 C

Double that.. that makes it 56

Subtract 5 (actually 5.6, you are moving one decimal to the left..but leave the .6 off)

That gives you 51

Add 32

So 28 C = 83 F

(I have not found a similar way for F to C)

F= C/5X9+32= Celsius

C= F-32/9X5= Fahrenheit

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13y ago

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