289 LearnersLast updated on May 26th, 2025
Square root of 361
Square root is simply a number value that when multiplied with itself gives the original number. We apply square roots when we make financial estimations and solve practical problems in geometry.
What is the square root of 361?
The square root is the number that gives the original number when squared.
√361 = 19,
in exponential form it is written as √361 =.3611/2 =19
In this article we will learn more about the square root of 361, how to find it and common mistakes one may make when trying to find the square root.
Finding the square root of 361
To find the square root of a number of students learn many methods. When a number is a perfect square and the process of finding square root is simple.
Square root using the prime factorization method
Breakdown 361 into prime factors, group them, and the result is the square root.
Step 1: Prime factorize
361 = 19×19
Step 2: Group factors in pairs
√361 = √19×19
Step 3: Multiply factors to find the square root
√361 = 19
Square root of 361 using the division method
Pair the digits, begin with the largest square and continue the subtraction and division till we find the result which is the square root of the number.
Step 1: Pair 361
361 → (3)(61)
Step 2: pick a number whose square is ≤ 3, 12=1
— 1 is the quotient.
— Subtract the numbers, 3-1=2.
— Bring down the numbers 61 next to the remainder, we get 261.
Step 3: double quotient and use it as the first digit of the new divisor’s
— Double 1
— Now find the digit x in a way that 2x×x ≤ 261
— x is 9, 29×9 = 261.
Step 4: Now find the final quotient
— The quotient we are left with 19, the square root of √361
The result; √361 = 19
Square root of 361 using the repeated subtraction method
Subtract odd numbers that are consecutive, keep track of the number of subtractions until we reach 0.
Step 1: Start the subtraction of consecutive odd numbers from 361, starting from 1.
Step 2: Maintain a count of the number of the subtractions performed
361-1= 360
360-3 =357
357-5=352
352-7=345
Step 3: Continue the subtraction until the remainder is 0.
After performing 19 subtractions, the remainder is 0. The square root of the number is 19.
The result; √361 = 19
Common mistakes and how to avoid them in square root of 361
Students make errors when learning to find the square root of a number. Here are errors and tips to avoid them.
Mistake 1
Working individually on the numbers instead of working in pairs
When finding the square using the long division method, one may forget to work on pairs and not as individual numbers.
Square root of 361 Examples
Problem 1
If x=√361 = solve x²+4x+5.
We know √361=19,
so x=19. Now substitute x into the expression:
x2+4x+5
=192+4(19)+5
=361+76+5
=442
Explanation
First, square x, then substitute into the equation to get the result.
Problem 2
Determine whether 361 is a prime or composite number using its square root.
The square root of 361 is ±19, meaning 361 is the square of 19. Since 19 is a prime number, and 361 has factors other than 1 and 361 (i.e.,19×19), 361 is a composite number.
Explanation
A composite number has more than two factors. Since 361 has a factorization involving 19, it is not a prime number.
Problem 3
Find the difference between the square roots of 400 and 361
First, find the square roots of 400 and 361:
√400= 20 and √361=19
Now find the difference:
20−19=1
Explanation
The square roots of 400 and 361 are 20 and 19, respectively, and their difference is 1.
FAQs on the Square root of 361
1.Is 361 irrational?
2.Is 361 a cube root?
3.Is 5√7 irrational?
4.What is the square root of 8?
5.Is 2025 a perfect square?
Important glossaries for the square root of 361
- Prime numbers — A number that has only two factors, 1 and the number itself. Prime numbers up to 10 are — 2,3,5,7.
- Integer — A number between zero and infinite, that can be positive or negative, fraction or decimal.
- Perfect square number — a number whose square root has no decimal places in them. For example, the square root of 3600.
- Non-perfect square numbers — A number whose square has a fraction or decimal in its result. For example, square root of 117.
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Jaskaran Singh Saluja
About the Author
Jaskaran Singh Saluja is a math wizard with nearly three years of experience as a math teacher. His expertise is in algebra, so he can make algebra classes interesting by turning tricky equations into simple puzzles.
Fun Fact
: He loves to play the quiz with kids through algebra to make kids love it.
