120 LearnersLast updated on May 26th, 2025
Square Root of 249
If a number is multiplied by the same number, the result is a square. The inverse of the square is a square root. The square root is used in the field of vehicle design, finance, etc. Here, we will discuss the square root of 249.
What is the Square Root of 249?
The square root is the inverse of the square of the number. 249 is not a perfect square. The square root of 249 is expressed in both radical and exponential form. In the radical form, it is expressed as √249, whereas (249)^(1/2) in the exponential form. √249 ≈ 15.7797, which is an irrational number because it cannot be expressed in the form of p/q, where p and q are integers and q ≠ 0.
Finding the Square Root of 249
The prime factorization method is typically used for perfect square numbers. However, for non-perfect square numbers, the long-division method and approximation method are more appropriate. Let us now learn the following methods:
- Prime factorization method
- Long division method
- Approximation method
Square Root of 249 by Prime Factorization Method
The product of prime factors is the Prime factorization of a number. Now let us look at how 249 is broken down into its prime factors:
Step 1: Finding the prime factors of 249 Breaking it down, we get 3 x 83: 3^1 x 83^1
Step 2: Now we have found out the prime factors of 249. Since 249 is not a perfect square, the digits of the number can’t be grouped into pairs.
Therefore, calculating √249 using prime factorization is not straightforward.
Square Root of 249 by Long Division Method
The long division method is particularly used for non-perfect square numbers. In this method, we should check the closest perfect square number for the given number. Let us now learn how to find the square root using the long division method, step by step.
Step 1: To begin with, we need to group the numbers from right to left. In the case of 249, we need to group it as 49 and 2.
Step 2: Now we need to find n whose square is 2. We can say n as ‘1’ because 1 x 1 is lesser than or equal to 2. Now the quotient is 1, after subtracting 1 from 2, the remainder is 1.
Step 3: Now let us bring down 49, which is the new dividend. Add the old divisor with the same number, 1 + 1, and we get 2, which will be our new divisor.
Step 4: The new divisor will be the sum of the dividend and quotient. Now we have 2n as the new divisor, we need to find the value of n.
Step 5: The next step is finding 2n x n ≤ 149. Let us consider n as 7, now 2 x 7 x 7 = 98
Step 6: Subtract 149 from 98, the difference is 51, and the quotient is 17.
Step 7: Since the dividend is greater than the divisor, we need to add a decimal point. Adding the decimal point allows us to add two zeroes to the dividend. Now the new dividend is 5100.
Step 8: Now we need to find the new divisor that is 157, because 157 x 3 = 471.
Step 9: Subtracting 471 from 5100, we get the result 429.
Step 10: Now the quotient is 15.7.
Step 11: Continue doing these steps until we get two numbers after the decimal point. Suppose there are no decimal values; continue till the remainder is zero. So the square root of √249 is approximately 15.78.
Square Root of 249 by Approximation Method
The approximation method is another method for finding the square roots; it is an easy method to find the square root of a given number. Now let us learn how to find the square root of 249 using the approximation method.
Step 1: Now we have to find the closest perfect square of √249. The smallest perfect square less than 249 is 225, and the largest perfect square greater than 249 is 256. √249 falls somewhere between 15 and 16.
Step 2: Now we need to apply the formula that is (Given number - smallest perfect square) / (Greater perfect square - smallest perfect square). Going by the formula (249 - 225) / (256 - 225) ≈ 0.7742. Using the formula, we identified the decimal point of our square root. The next step is adding the value we got initially to the decimal number, which is 15 + 0.7742 ≈ 15.7742, so the square root of 249 is approximately 15.77.
Common Mistakes and How to Avoid Them in the Square Root of 249
Students do make mistakes while finding the square root, such as forgetting about the negative square root or skipping long division methods. Now let us look at a few of those mistakes that students tend to make in detail.
Mistake 1
Forgetting about the negative square root
It is important to make students aware that a number does have both positive and negative square roots. However, we will be taking only the positive square root, as it is the required one.
For example: √50 = 7.07, there is also -7.07 which should not be forgotten.
Mistake 2
Not adding the square root symbol in proper places
Not using the square root properly is another mistake that children make. To resolve this, we need to teach children that simplifying the numbers inside the square root is important before moving on to the second step.
For Example: √(12+24) = √12 + √24 is the wrong method of using roots. The right way of using roots is √(12+24) = √36.
Mistake 3
Not finding the correct value of a non-perfect square
The first step that needs to be taught to children is to simplify the numbers inside the square root. This is important so that students do not make mistakes while identifying the approximate value.
For Example: √50 = 7 is wrong, the correct answer is √50 ≈ 7.071.
Mistake 4
Confusing the square root symbol with the cube root
Students need to be taught the difference between cube root and square root constantly, as this will help them avoid mistakes.
For Example: √50 and ∛50 are different.
Mistake 5
Making mistakes in long division
Finding a square root using the Long Division method involves many steps. Due to this, many students might skip a step accidentally, which results in a wrong answer at the end of the sum. This may either happen in subtracting or elsewhere.
Square Root of 249 Examples
Problem 1
Can you help Max find the area of a square box if its side length is given as √249?
The area of the square is approximately 249 square units.
Explanation
The area of the square = side^2.
The side length is given as √249.
Area of the square = side^2 = √249 x √249 = 249.
Therefore, the area of the square box is approximately 249 square units.
Problem 2
A square-shaped garden measuring 249 square feet is built; if each of the sides is √249, what will be the square feet of half of the garden?
124.5 square feet
Explanation
We can just divide the given area by 2 as the garden is square-shaped.
Dividing 249 by 2 = we get 124.5.
So half of the garden measures 124.5 square feet.
Problem 3
Calculate √249 x 5.
78.899
Explanation
The first step is to find the square root of 249, which is approximately 15.7797.
The second step is to multiply 15.7797 by 5.
So 15.7797 x 5 ≈ 78.899.
Problem 4
What will be the square root of (225 + 24)?
The square root is 16.
Explanation
To find the square root, we need to find the sum of (225 + 24).
225 + 24 = 249, and then the square root of 249 is approximately 15.7797.
However, the square root of a perfect square close to this sum is 16, as 256 is a perfect square.
Therefore, the square root of (225 + 24) is approximately ±15.7797.
Problem 5
Find the perimeter of the rectangle if its length ‘l’ is √249 units and the width ‘w’ is 40 units.
We find the perimeter of the rectangle as approximately 111.56 units.
Explanation
Perimeter of the rectangle = 2 × (length + width).
Perimeter = 2 × (√249 + 40)
≈ 2 × (15.7797 + 40)
≈ 2 × 55.7797
≈ 111.56 units.
FAQ on Square Root of 249
1.What is √249 in its simplest form?
2.Mention the factors of 249.
3.Calculate the square of 249.
4.Is 249 a prime number?
5.249 is divisible by?
6.How does learning Algebra help students in Australia make better decisions in daily life?
7.How can cultural or local activities in Australia support learning Algebra topics such as Square Root of 249?
8.How do technology and digital tools in Australia support learning Algebra and Square Root of 249?
9.Does learning Algebra support future career opportunities for students in Australia?
Important Glossaries for the Square Root of 249
- Square root: A square root is the inverse of a square. Example: 4^2 = 16, and the inverse of the square is the square root, that is √16 = 4.
- Irrational number: An irrational number is a number that cannot be written in the form of p/q, where q is not equal to zero, and p and q are integers.
- Principal square root: A number has both positive and negative square roots; however, the positive square root is more commonly used and is known as the principal square root.
- Prime factorization: The expression of a number as a product of its prime factors. For example, the prime factorization of 249 is 3 x 83.
- Decimal approximation: This refers to expressing an irrational number in decimal form to a certain degree of accuracy. For example, √249 ≈ 15.7797.
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Jaskaran Singh Saluja
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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.
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