Fastest way to find out square up to 999: Get square of 1 to three digits in a second.
To find out square of any two digits or above number by convention method is not an easy task. Usually, it takes lots of time and tedious multi level multiplication as a result students get tire and bore.
They need to get some short-cut method to find out square
of big numbers as they move to upper classes. There are some examples of
difficult square that can be done verbally and needs pen and paper like; 372
692, 3572, 6972 9492 etc.
Don’t worry, Today, mathematics made easy brings some
useful method that will make your calculation quite easy. You can find out
square of difficult numbers of two or three digits number after little practice.
For
Two (2) Digit square
Method
1:-
Step one:- Suppose you wanted to find out square of 32
Write the desired
number with square sign. It is applicable in 2 digit numbers square.
(32)2
Step 2:- Multiply each digit and exponent power in this way
3 x 2 x 2 =12
Now, write square of first two numbers from your left side and add the number (12) right hand side of equals sing, leaving one’s digit place empty in this way
3 x 2 x 2 = 12
09 04
and add them 12
1024 this is your desired number or answer. Do you doubtful about result? Lets us check it by long method.
32
x 32 .
64
9 6..
1024
This is your desired result which is equal to result found via shortcut method. Is it not effect and time consuming in examination, "Isn't It"?.
Method 2:- This is universal method and applicable up to 999. It will also help you to find the square up to 3 digits in a second without pen and paper.
What is method?
Step 1:- To get the desire square, make it nearest
Suppose you wanted to get the square of 87. Make it
closed to that number that has 0 at one’s place. The nearest number is 90. You need
to add 3 to 87 to make it 90.
Now, subtract 3 from 87, the number comes out 84. Now
write it in this way,
90 x 84
Now, write square of 3 that is 9; in this way along with previous number
90 x 84 | 09
Divide 90 by 10 to remove 0 from one’s place and cancel it.
90/10 x 84 | 09
Now, multiply 9 with second number 84 and place 9 from 09. Add the carried digit at double digit place 0 with one digit place number of product of 9 x 84 that is 756.
9 x 84 | 09 = 756 | 09
Now, 9 will stay at one’s digit place and second digits place number 0 will carry and added to 756.
7569 and this is desired square of 87.
Isn’t interesting? Do more practice to make faster. The more you practice the more you get quickest.
Square of 213 = ?
Subtract 13 and add 13 and write square of 13 at extreme
right side.
200 x 226 | (13)2 = 169
200/100 x 226 | 169
2 x 226 | 169
452 | 169
= 45369
Sol:- Find nearest number having 0 at one’s place i.e., 750. Now subtract 3 from it and add 3 to it.
750 X 744 | 09
Now, cancel 0 from 750 by dividing it by 100 and multiply with 744
750/100 X 744 | 09
75/10 X 744 | 09
15/2 X 744 |09
We can write 15/2 as 30/4 for convenience to do the calculation. It won’t make any impact on this process but make calculation eaiser.
30/4 X 744 | 09
30 X (divide 744 by 4) 186 | 09
30 X 186 | 09
= 558009
Question: Find square of 888, 257, 668, 572, 345, 267,879 etc.
