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Last updated on May 26th, 2025

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Square Root of 158

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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 158.

Square Root of 158 for Thai Students
Professor Greenline from BrightChamps

What is the Square Root of 158?

The square root is the inverse of the square of the number. 158 is not a perfect square. The square root of 158 is expressed in both radical and exponential form. In the radical form, it is expressed as, √158, whereas (158)(1/2) in the exponential form. √158 ≈ 12.5698, 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.
square root of 158

Professor Greenline from BrightChamps

Finding the Square Root of 158

The prime factorization method is used for perfect square numbers. However, for non-perfect square numbers, the long-division method and approximation method are used. Let us now learn the following methods:

 

  • Prime factorization method
  • Long division method
  • Approximation method
Professor Greenline from BrightChamps

Square Root of 158 by Prime Factorization Method

The product of prime factors is the prime factorization of a number. Now let us look at how 158 is broken down into its prime factors.

 

Step 1: Finding the prime factors of 158 Breaking it down, we get 2 x 79: 21 x 791

 

Step 2: Now we found out the prime factors of 158. Since 158 is not a perfect square, the digits of the number can’t be grouped in pairs.

 

Therefore, calculating √158 using prime factorization alone is not practical.

Professor Greenline from BrightChamps

Square Root of 158 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 158, we need to group it as 58 and 1.

 

Step 2: Now we need to find n whose square is less than or equal to 1. We use n = 1 because 1 x 1 is less than or equal to 1. Now the quotient is 1, and after subtracting 1 - 1, the remainder is 0.

 

Step 3: Now let us bring down 58, which is the new dividend. Add the old divisor with the same number, 1 + 1, to get 2, which will be our new divisor.

 

Step 4: The new divisor will be the sum of the dividend and quotient. Now we get 2n as the new divisor, and we need to find the value of n.

 

Step 5: Find 2n × n ≤ 58. Let us consider n as 2, now 2 x 2 x 2 = 48.

 

Step 6: Subtract 58 from 48; the difference is 10, and the quotient is 12.

 

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 1000.

 

Step 8: Now we need to find the new divisor that is 9 because 249 x 9 = 2241.

 

Step 9: Subtracting 2241 from 2400, we get the result 159.

 

Step 10: Now the quotient is 12.5.

 

Step 11: Continue doing these steps until we get two numbers after the decimal point. Suppose if there is no decimal value, continue till the remainder is zero.

 

So the square root of √158 is approximately 12.57.

Professor Greenline from BrightChamps

Square Root of 158 by Approximation Method

The approximation method is another method for finding 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 158 using the approximation method.

 

Step 1: Now we have to find the closest perfect square of √158. The smallest perfect square less than 158 is 144, and the largest perfect square greater than 158 is 169. √158 falls somewhere between 12 and 13.

 

Step 2: Now we need to apply the formula: (Given number - smallest perfect square) / (Greater perfect square - smallest perfect square) Using the formula (158 - 144) ÷ (169 - 144) ≈ 0.56 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 12 + 0.56 = 12.56.

 

So the square root of 158 is approximately 12.57.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in the Square Root of 158

Students do make mistakes while finding the square root, such as forgetting about the negative square root and skipping steps in long division. Now let us look at a few of those mistakes that students tend to make in detail.

Mistake 1

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Forgetting about the negative square root

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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.

Max from BrightChamps Saying "Hey"

Square Root of 158 Examples

Ray, the Character from BrightChamps Explaining Math Concepts
Max, the Girl Character from BrightChamps

Problem 1

Can you help Max find the area of a square box if its side length is given as √158?

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The area of the square is approximately 158 square units.

Explanation

The area of the square = side^2.

The side length is given as √158.

Area of the square = side^2

= √158 x √158

= 158.

Therefore, the area of the square box is approximately 158 square units.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 2

A square-shaped building measuring 158 square feet is built; if each of the sides is √158, what will be the square feet of half of the building?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

79 square feet

Explanation

We can just divide the given area by 2 as the building is square-shaped.

Dividing 158 by 2, we get 79.

So half of the building measures 79 square feet.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 3

Calculate √158 x 3.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Approximately 37.71

Explanation

The first step is to find the square root of 158, which is approximately 12.57.

The second step is to multiply 12.57 with 3.

So 12.57 x 3 ≈ 37.71.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 4

What will be the square root of (148 + 10)?

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The square root is 12.

Explanation

To find the square root, we need to find the sum of (148 + 10).

148 + 10 = 158, and then √158 ≈ 12.57.

Therefore, the square root of (148 + 10) is approximately ±12.57.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 5

Find the perimeter of the rectangle if its length ‘l’ is √158 units and the width ‘w’ is 38 units.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

We find the perimeter of the rectangle as approximately 101.14 units.

Explanation

Perimeter of the rectangle = 2 × (length + width).

Perimeter = 2 × (√158 + 38)

= 2 × (12.57 + 38)

= 2 × 50.57

≈ 101.14 units.

Max from BrightChamps Praising Clear Math Explanations
Ray Thinking Deeply About Math Problems

FAQ on Square Root of 158

1.What is √158 in its simplest form?

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2.Mention the factors of 158.

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3.Calculate the square of 158.

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4.Is 158 a prime number?

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5.158 is divisible by?

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6.How does learning Algebra help students in Thailand make better decisions in daily life?

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7.How can cultural or local activities in Thailand support learning Algebra topics such as Square Root of 158?

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8.How do technology and digital tools in Thailand support learning Algebra and Square Root of 158?

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9.Does learning Algebra support future career opportunities for students in Thailand?

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Professor Greenline from BrightChamps

Important Glossaries for the Square Root of 158

  • 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, it is always the positive square root that is more prominent due to its uses in the real world. That is the reason it is also known as the principal square root.
     
  • Factors: Factors are numbers you multiply together to get another number. For example, 2 and 79 are factors of 158.
     
  • Decimal: If a number has a whole number and a fraction in a single number, then it is called a decimal. For example, 7.86, 8.65, and 9.42 are decimals.
Professor Greenline from BrightChamps

About BrightChamps in Thailand

At BrightChamps, we understand algebra is more than just symbols—it opens up a world of opportunities! Our mission is to help children across Thailand develop essential math skills, focusing today on the Square Root of 158 with a special look at square roots—in a lively, enjoyable, and easy-to-follow manner. Whether your child is discovering the speed of a roller coaster at Dream World, tallying local football scores, or managing their allowance to buy the latest gadgets, mastering algebra gives them confidence for everyday life. Our interactive lessons make learning fun and straightforward. Since children in Thailand have varied learning styles, we personalize our approach for each child. From Bangkok’s busy streets to Phuket’s tropical islands, BrightChamps brings math to life, making it relatable and exciting throughout Thailand. Let’s make square roots a joyful part of every child’s math journey!
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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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Max, the Girl Character from BrightChamps

Fun Fact

: He loves to play the quiz with kids through algebra to make kids love it.

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