Thread: Cool math shortcuts
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  #24  
Old 05-12-2005, 06:49 PM
mmbt0ne mmbt0ne is offline
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Join Date: Aug 2004
Location: Atlanta, GA
Posts: 700
Default Re: Cool math shortcuts
Mulitply any 2-digit number ab by 11 and it's a(b+a)b

Example:

12*11 = 1(1+2)2 = 132
17*11 = 1(1+7)7 = 187
39*11 = 3(3+9)9 = 429
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