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Convert from Centigrade to Fahrenheit in your head

The Rule:
To get the degrees Fahrenheit, double the degrees Centigrade (or Celsius), subtract 10% and add 32.
The Reasoning:
Let a temperature of C degrees Centigrade be equivalent to F degrees Fahrenheit. Then: F = (9/5)C + 32
_ = (18/10)C + 32
_ = [(20 - 2)/10]C + 32
_ = (2 - 0.2)C + 32
_ = 2C - 10%(2C) + 32
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Copyright (C) Anthony P. Stone 1996. This material may be freely used, provided the author is acknowledged.

Last updated: 8 March 2008