Teacher2Teacher 
Q&A #17351 
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From: alexis <@alexis math.com> To: Teacher2Teacher Public Discussion Date: 2010082619:39:49 Subject: Re: bow tie multiplication On 2007112423:30:43, julius nadas wrote: >I believe that the bowtie method was used back in Abraham Lincoln's >day and is just a graphic way of showing the FOIL method for >multiplying any pair of two digit numbers. I hope this comes out OK >in your browser: > >take 23 times 45. >In foil you add these terms: >20x40 + 20x5 + 3x40 + 3x5 > >in bowtie you draw this picture: > > >20 + 3 > \ / >  \ /  >  X  >  / \  > / \ >40 + 5 > >(see the bow tie) >and you multiply the numbers that are connected by lines. > > >
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