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Q&A #494

Teachers' Lounge Discussion: Multiplication tables

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From: Joan <WHITEFAIRY75@YAHOO.COM>
To: Teacher2Teacher Public Discussion
Date: 2005022623:26:43
Subject: Re: multiplication


Hi,

Here are the ways to master the tables 


Suppose you need 8 x 7 

8 is 2 below 10 and 7 is 3 below 10.
Think of it like this:
              8    2
            x 7    3
             --------
              5    6

The answer is 56.

Now I will explain how....

The units place if 56 ... that is 6 is obtained by multiplying the
differences 2 and 3

The tens place of 56..... that is 5 is obtained by finding the
difference diagonally....that is    8-3=5 or 7-2=5 !!!!

This works with all tables past 5


in effect you will have to learn only the tables upto 5x5 to master
all the multiplication in your schooling time.

Try out more examples:

9x7=?

Difference of 9 from 10 is 1
Difference of 7 from 10 is 3

So the units place is 3x1=3.
And the tens place is the difference.... 9-3 = 6   or 7-1=6.

Check out any of the numbers like this.

JOAN



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