125 LearnersLast updated on May 26th, 2025
Square Root of 1215
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 1215.
What is the Square Root of 1215?
The square root is the inverse of the square of the number. 1215 is not a perfect square. The square root of 1215 is expressed in both radical and exponential form. In the radical form, it is expressed as √1215, whereas (1215)^(1/2) in the exponential form. √1215 ≈ 34.848, 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 1215
The prime factorization method is used for perfect square numbers. However, the prime factorization method is not used for non-perfect square numbers where the long-division method and approximation method are used. Let us now learn the following methods:
- Prime factorization method
- Long division method
- Approximation method
Square Root of 1215 by Prime Factorization Method
The product of prime factors is the prime factorization of a number. Now let us look at how 1215 is broken down into its prime factors.
Step 1: Finding the prime factors of 1215 Breaking it down, we get 3 × 3 × 3 × 3 × 5 × 3: 3^5 × 5
Step 2: Now we found out the prime factors of 1215. The second step is to make pairs of those prime factors. Since 1215 is not a perfect square, the digits of the number can’t be grouped in pairs.
Therefore, calculating 1215 using prime factorization is impossible.
Square Root of 1215 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 1215, we need to group it as 15 and 12.
Step 2: Now we need to find n whose square is less than or equal to 12. We can say n as '3' because 3 × 3 = 9 is less than 12. Now the quotient is 3 after subtracting 9 from 12, the remainder is 3.
Step 3: Now let us bring down 15, which is the new dividend. Add the old divisor with the same number 3 + 3 we get 6, which will be our new divisor.
Step 4: The new divisor will be the sum of the dividend and quotient. Now we get 6n as the new divisor, we need to find the value of n.
Step 5: The next step is finding 6n × n ≤ 315. Let us consider n as 5, now 65 × 5 = 325, which is greater than 315. Try n as 4, 64 × 4 = 256.
Step 6: Subtract 256 from 315, the difference is 59, and the quotient is 34.
Step 7: Since the dividend is less 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 5900.
Step 8: Now we need to find the new divisor that is 698 because 698 × 8 = 5584.
Step 9: Subtracting 5584 from 5900, we get the result 316.
Step 10: Now the quotient is 34.8.
Step 11: Continue doing these steps until we get two numbers after the decimal point. Suppose if there are no decimal values, continue till the remainder is zero.
So the square root of √1215 is approximately 34.85.
Square Root of 1215 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 1215 using the approximation method.
Step 1: Now we have to find the closest perfect square of √1215. The smallest perfect square less than 1215 is 1156, and the largest perfect square greater than 1215 is 1225. √1215 falls somewhere between 34 and 35.
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 (1215 - 1156) / (1225 - 1156) = 59 / 69 ≈ 0.855. 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 34 + 0.855 ≈ 34.855, so the square root of 1215 is approximately 34.855.
Common Mistakes and How to Avoid Them in the Square Root of 1215
Students do make mistakes while finding the square root, like forgetting about the negative square root, skipping long division methods, etc. 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 and then move 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 keep away from 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 1215 Examples
Problem 1
Can you help Max find the area of a square box if its side length is given as √1250?
The area of the square is 1250 square units.
Explanation
The area of the square = side^2.
The side length is given as √1250. Area of the square = side^2 = √1250 × √1250 = 1250.
Therefore, the area of the square box is 1250 square units.
Problem 2
A square-shaped building measuring 1215 square feet is built; if each of the sides is √1215, what will be the square feet of half of the building?
607.5 square feet
Explanation
We can just divide the given area by 2 as the building is square-shaped.
Dividing 1215 by 2 = we get 607.5.
So half of the building measures 607.5 square feet.
Problem 3
Calculate √1215 × 5.
174.24
Explanation
The first step is to find the square root of 1215, which is approximately 34.85.
The second step is to multiply 34.85 with 5.
So 34.85 × 5 = 174.24.
Problem 4
What will be the square root of (1210 + 5)?
The square root is approximately 35.
Explanation
To find the square root, we need to find the sum of (1210 + 5).
1210 + 5 = 1215, and then √1215 ≈ 34.85.
Therefore, the square root of (1210 + 5) is approximately ±34.85.
Problem 5
Find the perimeter of the rectangle if its length ‘l’ is √1210 units and the width ‘w’ is 50 units.
We find the perimeter of the rectangle as 169.9 units.
Explanation
Perimeter of the rectangle = 2 × (length + width).
Perimeter = 2 × (√1210 + 50)
≈ 2 × (34.78 + 50)
≈ 2 × 84.78
≈ 169.9 units.
FAQ on Square Root of 1215
1.What is √1215 in its simplest form?
2.Mention the factors of 1215.
3.Calculate the square of 1215.
4.Is 1215 a prime number?
5.1215 is divisible by?
6.How does learning Algebra help students in Bahrain make better decisions in daily life?
7.How can cultural or local activities in Bahrain support learning Algebra topics such as Square Root of 1215?
8.How do technology and digital tools in Bahrain support learning Algebra and Square Root of 1215?
9.Does learning Algebra support future career opportunities for students in Bahrain?
Important Glossaries for the Square Root of 1215
- 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, 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, it is always the positive square root that has more prominence due to its uses in the real world. That is the reason it is also known as a principal square root.
- Prime factorization: The process of expressing a number as a product of its prime numbers. For example, the prime factorization of 18 is 2 × 3 × 3.
- Long division method: A technique used to find the square root of non-perfect squares by dividing the number step by step.
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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.
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