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http://laserlike.com/2009/08/02/3-quick-and-dirty-business-hacks/
by Mike Speiser at Laserlike

Excerpt

My mother was a high school mathematics teacher and understood that kids learn best when learning is fun, so at a very young age she started teaching me math “tricks.” In the second grade she showed me how 9 times any number less than 10 was simply that number minus 1 concatenated with the sum of difference plus whatever it takes to get back to 9. For example, 9 x 8 is 8 minus 1 (7) concatenated with 9 minus 7 (2) — 72. I was hooked.

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