How To Easily Convert From Centigrade/Celsius to Fahrenheit

The standard formula (F = 9/5C + 32) is not that easy to use.
To create an easy estimate, simply double the Centigrade temp, then subtract the first digit of that result from the result, then add 32.
The resulting estimate should not be more than 1 degree Fahrenheit off.
Exact method yields a conversion from 44 degrees C to 111.2 degrees F.
The estimation method:
44°C x 2 = 88
88 – 8 = 80;
80 + 32 = 112°F
As you can see, our estimate is less than one degree off, and that is good enough for me!
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