Square a 2 Digit Number, for this example 37:

> Look for the nearest 10 boundary

> In this case up 3 from 37 to 40.

> Since you went UP 3 to 40 go DOWN 3 from 37 to 34.

> Now mentally multiply 34x40

> The way I do it is 34x10=340;

> Double it mentally to 680

> Double it again mentally to 1360

> This 1360 is the FIRST interim answer.

> 37 is "3" away from the 10 boundary 40.

> Square this "3" distance from 10 boundary.

> 3x3=9 which is the SECOND interim answer.

> Add the two interim answers to get the final answer.

> Answer: 1360 + 9 = 1369

### Square 2 Digit Number:WITH UP-DOWN Method

Posted by
SHRENIK
on Wednesday, July 15, 2009

Labels:
FUN,
FUN WITH NUMBERS,
SQUARE OF A NUMBER

## 1 comments:

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