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Q&A #494

Teachers' Lounge Discussion: Multiplication tables

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From: Loyd <loydlin@aol.com>
To: Teacher2Teacher Public Discussion
Date: 2005022610:50:15
Subject: Re: multiplication; nines and 7x8

Nines are easy since the digits add to 9.  Study the pattern:

1x9= 09  (0+9=9)  
2x9= 18  (1+8=9)
3x9= 27  (2+7=9)
4x9= 36  (3+6=9)
5x9= 45  (4+5=9)
6x9= 54  (5+4=9)
7x9= 63  (6+3=9)
8x9= 72  (7+2=9)
9x9= 81  (8+1=9)

7x8 is easy, since before you can get to the 7th and 8th grade you
have to go through the 5th and 6th.

Thus, 7x8=56



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