how to find the square root using the long division method
Answers
Answer:
Full SiteNavigation
Square Root of a Perfect Square by Using the Long Division Method
Custom Search
To find the square root of a perfect square by using the long division method is easy when the numbers are very large since, the method of finding their square roots by factorization becomes lengthy and difficult.
Steps of Long Division Method for Finding Square Roots:
Step I: Group the digits in pairs, starting with the digit in the units place. Each pair and the remaining digit (if any) is called a period.
Step II: Think of the largest number whose square is equal to or just less than the first period. Take this number as the divisor and also as the quotient.
Step III: Subtract the product of the divisor and the quotient from the first period and bring down the next period to the right of the remainder. This becomes the new dividend.
Step IV: Now, the new divisor is obtained by taking two times the quotient and annexing with it a suitable digit which is also taken as the next digit of the quotient, chosen in such a way that the product of the new divisor and this digit is equal to or just less than the new dividend.
Step V: Repeat steps (2), (3) and (4) till all the periods have been taken up. Now, the quotient so obtained is the required square root of the given number.
Examples on square root of a perfect square by using the long division method
1. Find the square root of 784 by the long-division method.
Solution:
Marking periods and using the long-division method,
Therefore, √784 = 28
2. Evaluate √5329 using long-division method.
Solution:
Marking periods and using the long-division method,
Therefore, √5329 =73
3. Evaluate: √16384.
Solution:
Marking periods and using the long-division method,
Therefore, √16384 = 128.
4. Evaluate: √10609.
Solution:
Marking periods and using the long-division method,
Therefore, √10609 = 103
5. Evaluate: √66049.
Solution:
Marking periods and using the long-division method,
Therefore, √66049 = 257
6. Find the cost of erecting a fence around a square field whose area is 9 hectares if fencing costs $ 3.50 per metre.
Solution:
Area of the square field = (9 × 1 0000) m² = 90000 m²
Length of each side of the field = √90000 m = 300 m.
Perimeter of the field = (4 × 300) m = 1200 m.
Cost of fencing = $(1200 × ⁷/₂) = $4200.
7. Find the least number that must be added to 6412 to make it a perfect square.
Solution:
We try to find out the square root of 6412.
We observe here that (80)² < 6412 < (81)²
The required number to be added = (81)² - 6412
= 6561 – 6412
= 149
Therefore, 149 must be added to 6412 to make it a perfect square.
8. What least number must be subtracted from 7250 to get a perfect square? Also, find the square root of this perfect square.
Solution:
Let us try to find the square root of 7250.
This shows that (85)² is less than 7250 by 25.
So, the least number to be subtracted from 7250 is 25.
Required perfect square number = (7250 - 25) = 7225
And, √7225 = 85.
9. Find the greatest number of four digits which is a perfect square.
Solution
Greatest number of four digits = 9999.
Let us try to find the square root of 9999.
This shows that (99)² is less than 9999 by 198.
So, the least number to be subtracted is 198.
Hence, the required number is (9999 - 198) = 9801.
10. What least number must be added to 5607 to make the sum a perfect square? Find this perfect square and its square root.
Solution:
We try to find out the square root of 5607.
We observe here that (74)² < 5607 < (75)²
The required number to be added = (75)² - 5607
= (5625 – 5607) = 18
11. Find the least number of six digits which is a perfect square. Find the square root of this number.
Solution:
The least number of six digits = 100000, which is not a perfect square.
Now, we must find the least number which when added to 1 00000 gives a perfect square. This perfect square is the required number.
Now, we find out the square root of 100000.
Clearly, (316)² < 1 00000 < (317)²
Therefore, the least number to be added = (317)² - 100000 = 489.
Hence, the required number = (100000 + 489) = 100489.
Also, √100489 = 317.
12. Find the least number that must be subtracted from 1525 to make it a perfect square.
Solution:
Let us take the square root of 1525
We observe that, 39² < 1525
Therefore, to get a perfect square, 4 must be subtracted from 1525.
Therefore the required perfect square = 1525 – 4 = 1521
Step-by-step explanation:
Hope this is helpful please mark as brainliest..
Answer:
root over of 289 is in attachment refer to it
Step-by-step explanation:
Here first write ij division form
then part the given no. from r8 side by taking 2-2 in each part
then see the 1st part from left side and choose a no. whose square is just less than first part or equal to 1st part from left( here 2 is 1st part from left and the square of 1 is just less than 2 so we took 1 in the quotient and divisor
Then add the divisor with the quotient (all the time divisor is equal to quotient so we add 1 to 1 in divisor)
then we got 2 in 2nd divisor and reminder as 1
we bring 89 to the down and hence dividend becomes 189
we have to choose that no. on which multiplying with yhe divisor we get the same as dividend
so we chose 7 so that divisor becomes 27 and when we multiply 7 with 27 we get 189 equal to dividend
so hence we got 17
follow me and mark it brainliest
