|
|
Source - http://www.magicalmethods.com/
Today, I will be describing how to find square of a digit near 100.
Say you want to find Square of 98.
98 is 2 away from 100. So what?
The square will be given by
98-2/square of 2 = 9604
Say you want to find Square of 97
97 is 3 away from 100. Square of this will be given by
97-3/square of 3 = 9409
Let us take one example which is more than 100.
Say you want to find square of 102
102 is 2 away from 100, its 2 more than 100 therefore we will add 2
more to it and the square will be given by
102+2/square of 2 = 10404
After going through these three examples you should be able to
understand the technique. The technique is to reduce or add as much
as it is away from 100 and put square of difference on it. This is
how we do it. We will have something more on this next week.
Pradeep Kumar
Chief Trainer
B. Tech, MBA (IIM Bangalore)
|
|
