Teacher2Teacher 
Q&A #494 
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From: Loyd To: Teacher2Teacher Public Discussion Date: 2005030115:42:56 Subject: Re: Re: multiplication Joan: That technique is neat. That is the first time I ever saw that. However, it is not to good when the numbers on the right are large (10the number) but it still works but may get into negative numbers. The number on the lefe is the number of tens: For example: One that works: 9 1 7 3 (93 and 71=6)  6 3 6 tens + 3=63 Try this one: 5 5 4 6  1 30 here you have to consider 45=1 or actually 10. 10 + 30 = 20. I am not sure that a 3, 4 or 5th grade student can use this to great value. But it does work for some of the harder ones.
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