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Teachers' Lounge Discussion: alternative ways to mulitply

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From: julius nadas

To: Teacher2Teacher Public Discussion
Date: 2007112423:30:43
Subject: bow tie multiplication

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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