Q. Find the square root of 42.25 using long division method.
Set up problem: Set up the problem in long division format.Place 42.25 under a square root symbol, which is similar to a long division symbol. Group the digits in pairs, starting from the decimal point and moving to the left and to the right. For 42.25, we have two pairs: 42 and 25.
Find largest square number: Find the largest square number less than or equal to the first pair 42. The largest square number less than or equal to 42 is 36 because 6×6=36.
Subtract square number: Subtract the square number 36 from the first pair 42 to get the remainder.42−36=6. Bring down the next pair of digits 25 next to the remainder to get 625.
Double and form new divisor: Double the divisor (6) and write it down with a blank digit on its right to form a new divisor.Doubling 6 gives us 12, and we write it as 12_ with a blank digit to find out.
Determine largest digit: Determine the largest digit X that fits in the blank of 12X such that 12X×X≤625.The largest value for X that satisfies 12X×X≤625 is 5 because 125×5=625.
Subtract product from remainder: Subtract the product of the new divisor and the new digit from the remainder.625−(125×5)=625−625=0. There is no remainder.
Write down result: Write down the result.The result of the square root of 42.25 is the combination of the digits found in Steps 2 and 5, which are 6 and 5 respectively.
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