E EmptyNest Administrator Apr 1, 2010 #1 Quick: What's 192...without your calculator? (361.) Squaring complex, two-digit numbers in your head isn't that difficult if you know a simple trick, according to the Secrets of Mental Math author Michael Shermer. More » </img> </img> </img> </img>
Quick: What's 192...without your calculator? (361.) Squaring complex, two-digit numbers in your head isn't that difficult if you know a simple trick, according to the Secrets of Mental Math author Michael Shermer. More » </img> </img> </img> </img>
