In this trick we will learn to calculate the square of all the numbers from 51 to 59.
Short Trick:
52 + (Right Digit)|(Right Digit)2
Note: (Right Digit)2 should be a two digit number. if it is not add ‘0’ before it to make it two digit. Let’s understand it with help of Example.
Let’s find (54)2
Solution:
Here, Right digit of 54 is 4
Therefore,
(54)2 = (5)2 + 4|(4)2
= (25) + 4|(16)
= 29|16
= 2916
Let’s find (53)2
Solution:
Here, Right digit of 53 is 3
Therefore,
(53)2 = (5)2 + 3|(3)2
= (25) + 3|(9)
= 28|09 (we added a ’0’ because 9 is single digit)
= 28|09
= 2809