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A comment on A mathematician's way of converting miles to kilometers. Parent comment

Re:A mathematician's way of converting miles to kilometers by FartyMcFarter on Saturday August 10, 2019 @03:38AM (#20660736)
Adding 10% of the original number to that is often easy as well, and makes the estimate very close to the correct conversion.
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Re:A mathematician's way of converting miles to kilometers by hestipod on Saturday August 10, 2019 @01:42PM (#20663454)
Works great for kg/lb conversions too.

kg x2 + 10% = lbs

lbs /2 - 10% = kg

I've yet to find a fast one for C to F temp conversions though. It takes a bit longer to do the 9/5-5/9 + or - equation in your head.

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