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Teachers' Lounge Discussion: alternative ways to mulitply

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From: Helen Valdez

To: Teacher2Teacher Public Discussion
Date: 2010101409:56:14
Subject: Re: bow tie multiplication

On 2007112423:30:43, julius nadas wrote: >I believe that the bow-tie 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 bow-tie 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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