Square root is a value that when multiplied by itself, gives the original number.
(√ )This is the radical symbol used to represent the square root of numbers.
Formula to calculate square root.
Usually, most people use calculators to calculate the square roots of numbers, which is very easy and more convenient when time is a factor to be considered.
There are many methods to calculate square root by hand, but we will use the one that uses a number’s factors to find the number’s square root.
Find the square root of 400.
We first need to know the two perfect squares whose product is 400 and they are 25 and 16.
Since 25 and 6 are perfect square and most people know that their square roots are 5 and 4 respectively, then to know the square root of 400, we will multiply 5 by 4.
= 5 x 4
Therefore, 20 is the square root of 400.