Mental Math Shortcuts | BetterExplained

From the page: "Here's a collection of time-saving math shortcuts, great for back-of-the-envelope estimates."

Reviewed by felizcumplevale Jul 24 2007, 10:33pm ( 32 reviews ) • betterexplained.com

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Reviewed by frederick09 on Aug 01, 5:43pm

Yeah, needs more metric, but otherwise quite useful. US Imperial > Metric conversions arn't that hard so its not a serious fault.
Rated by Refrakktion on Jun 10 2009, 12:20am

Needs more metric, and less arcane nonsense units.
Rated by saddy1 on Aug 09 2007, 9:08pm

I did not know: "a% of b = b% of a"
Rated by TMacForsyth on Aug 09 2007, 12:09am

I picked some of these up in HS physics, but I'd never thought about a few of these... helpful stuff!
Rated by iwp506 on Aug 05 2007, 6:46pm

nice tricks
Rated by Thanuir on Aug 04 2007, 9:40am

Mental shortcuts when using arcane and complicated measurements of distance.
Rated by winona on Aug 03 2007, 1:27pm

From the page: "What's 43% of 200? Same as 200% of 43: 86."

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