For finding square root of complete squares, we must memorize the squares of numbers 1 to 9.
Squares of 1 and 9 have 1 in the units place.
Squares of 2 and 8 have 4 in the units place.
Squares of 3 and 7 have 9 in the units place.
Squares of 4 and 6 have 6 in the units place.
Squares of 5 have 5 in the units place.
We use these facts to find square roots.
Find the square root of 784.
Divide the given number into two groups such that.
2 into 3 is equal to 6.
7 is greater than 6.
Thus, choose the greater of 2 and 8.
Therefore square root of 784 is 28.
Let us take another example.
Find the square root of 1849.