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Forum: Other Other Topics 05-12-2005, 06:49 PM
Replies: 41
Views: 179
Posted By mmbt0ne
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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