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Monday, November 28, 2011

Multiplication by 11 through a special method

Qs. 134 * 11=?
Write down the answer one figure at a time, from right to left as in any multiplication. Prefix a zero to the multiplicand so that it reads 0134.
0134
To the right digit 4 add its right neighbor (right neighbor is the right) , there is no neighbor in the right so add 0.
4+0 = 4
To the right digit 4 add its right neighbor 3 so
4+3=7
To the next digit 1 right neighbor is 3 So,
3+1=4
To 0 the right neighbor is 1 so,
0+1=1
So, therefore, 134*11= 1474
0134*11=
4
7
4
1
= 1474
Another example
3456 into 11=
3 80 16
If in the process of addition, you get a two digit number, set down only the right digit and carry the left digit.
You can check it through yours conventional method.
sasono

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