Thursday, 6 April 2017

Calculation Tricks III- Finding Squares of Numbers from 26 to 75

In this post we will discuss how to calculate square of numbers using calculation tricks that will save you time in SBI PO and other Competitive Exams.

Finding Squares


Nothing is more useful in IBPS and SSC Exams than calculation tricks because sometimes knowing the concept is just not enough! It is these calculation tricks that help you reach your answer in less time and attempt more questions. Finding Squares of numbers is both frustrating and time consuming in a competitive exam.    In this post, which is the 12th in the series of smart methods, we will be discussing a method that will help you in finding squares with the blink of an eye.


Finding Squares

What are Squares

In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself. For example, 9 is a square number, since it can be written as 3 × 3.
Finding Squares

Example of questions on Finding Squares

What is the square of 63?
1) 3609      2)3969      3) 3729      4) 3909      5) None of these


Conventional Method of Finding Squares

Go back to school and recall how we were taught to calculate squares of numbers. It involves copious amount of paper work where we multiply both the numbers and reach the answer of 3969 in about 10 seconds.
Finding Squares

Do we approve this method? No! It’s not a good idea to spend so much time when a calculation tricks can help you save all that time.


Smart Method of Finding Squares

Since you are preparing for competitive exams we are going to be presumptuous enough to believe that you know squares of numbers till 25 like the back of your hand as most calculation tricks makes effective use of it and the formula of (a+ b)2 = (a +  b)2= a2 + 2ab + b2

Step 1:
N2= (50 + y)2= 502 + (2 x 50 x y) + y2

Step 2:
N2= 2500 + 100y + y2

Step 3:
632= (50+ 13)2 = 2500+ (100 x 13) + 169= 2500+ 1300+ 169= 3969

If you notice, effectively there is only one step and one really simple calculation to get the right answer!
Finding Squares
Finding Squares
Watch our expert faculty explain this calculation trick in the video below.



Try finding squares of these numbers-
Question 1: What is the square of 47?
1) 2209      2) 3039      3) 3729      4) 2309      5) None of these

Question 2: What is the square of 39?
1) 1321      2) 1627      3) 1521      4) 1781      5) None of these

Do leave your answer in the comments below and tell us how much time it took you in finding square of these numbers.

Keep reading and keep watching for more smart methods! And use these calculation tricks to save time even when you practice!
Finding Squares


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