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Old 08-05-2009, 02:45 PM   #38
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Posts: 184
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Quote:
Originally Posted by Alexander Turcic View Post
Or if you are quick at math, subtract 32, then multiply by 5 and divide by 9.
5/9 happens to be 0.55555, the observing person quickly sees how you can calculate that, it's ½ + ½ /10 + ½ /100

So for the 50°F example the result is
50 -32 = 18
18 / 2 = 9
9 + 0.9 + 0.09 ≈ 10°C
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