Well Adam, yes and no. Do the arithmetic yourself; you'll find that your adding or subtracting 32 before or after multiplying or dividing by nine-fifths is much more difficult to remember and yet gives the same result as my easy-to-remember symmetric formula. My formula is based on a mathematic result, namely that when a domain is mapped into itself 1-to-1, there will be a fixed point. In the case of Franenheit and Celsius, that point is -40°.
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From: Adam Fikso <adam14113@ameritech.net>
To: Pacific Bulb Society <pbs@lists.ibiblio.org>
Sent: Monday, February 9, 2009 2:36:18 PM
Subject: Re: [pbs] converting ºC to ºF or ºF to ºC
° David? Isn't the conversion formula supposed to be 5/9ths or 9/5ths +
or - 32--not 40.? That's what I remember from Berkeley High School, and U
of C.
A little trick I learned in Hight School:
Add 40º
multiply by 5/9 or 9/5, depending upon which way you want to go
Subtract 40º
This rule is far easier to remember than any other.