document.write( "Question 422309: HOW TO SOLVE MENTALY THIS IN 5 SECONDS 68*69 \n" ); document.write( "

Algebra.Com's Answer #294770 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "HOW TO SOLVE MENTALY THIS IN 5 SECONDS 68*69
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document.write( "the 'Quick' Idea is based on 68*69 = (70-2)(70-1) = 4900-3*70 +2 ..4690 + 2
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document.write( "     4692 \n" );
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