Square root of 56.25 = 7.5
(1): To find the square root of a decimal number we put bars on the integral part(i.e.,56) of the number in the usual manner. And place
bars on the decimal part (i.e.,25) on every pair of digits beginning with the first decimal place. .
(2): Find the largest number whose square is ≤ the number under the extreme left bar (72 <56< 82). Take this number as the divisor and the quotient with number under extreme left bar as the dividend. Divide and get the remainder.( 7 in this case)
(3): The remainder is 7. Write the number under the next bar(i.e.,25) to the right of this remainder to get, 725
(4): Double the divisor and place this digit at ten’s place of new divisor (7+7 in this case).
(5): We know that 145 × 5 = 725, ∴ the new digit is 5.
Divide and get the remainder.
(6): Since the remainder is 0 and no bar is left,
∴ = 7.5
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