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Last updated on May 26th, 2025

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Square Root of 668

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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 fields such as vehicle design, finance, etc. Here, we will discuss the square root of 668.

Square Root of 668 for Australian Students
Professor Greenline from BrightChamps

What is the Square Root of 668?

The square root is the inverse of the square of the number. 668 is not a perfect square. The square root of 668 is expressed in both radical and exponential form. In the radical form, it is expressed as √668, whereas (668)^(1/2) in exponential form. √668 ≈ 25.835, 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.

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Finding the Square Root of 668

The prime factorization method is used for perfect square numbers. However, the prime factorization method is not typically used for non-perfect square numbers where methods like the long-division method and approximation method are preferred. Let us now learn the following methods:

 

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

Square Root of 668 by Prime Factorization Method

The product of prime factors is the prime factorization of a number. Now let us look at how 668 is broken down into its prime factors.

 

Step 1: Finding the prime factors of 668 Breaking it down, we get 2 x 2 x 167.

 

Step 2: Now we have found the prime factors of 668. The second step is to make pairs of those prime factors. Since 668 is not a perfect square, the digits of the number can’t be grouped in pairs.

 

Therefore, calculating the exact square root of 668 using prime factorization is not feasible.

Professor Greenline from BrightChamps

Square Root of 668 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 668, we group it as 68 and 6.

 

Step 2: Now we need to find n whose square is less than or equal to 6. We can say n is ‘2’ because 2 x 2 = 4, which is less than 6. Now the quotient is 2, and after subtracting 4 from 6, the remainder is 2.

 

Step 3: Bring down 68 to make it the new dividend, making it 268. Double the quotient to get the new divisor, which is 4.

 

Step 4: Find a number X such that 4X x X is less than or equal to 268. We find X = 6 because 46 x 6 = 276, which is too high. Trying X = 5, we find 45 x 5 = 225, which is correct.

 

Step 5: Subtract 225 from 268 to get 43. Since 43 is less than the divisor, we need to add a decimal point and bring down two zeros.

 

Step 6: With the new dividend as 4300, repeat the process of finding the next digit in the quotient. Continue these steps until reaching the desired decimal precision.

 

The square root of 668 is approximately 25.83.

Professor Greenline from BrightChamps

Square Root of 668 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 668 using the approximation method.

 

Step 1: Identify the closest perfect squares around 668. The smallest perfect square less than 668 is 625 (25^2), and the largest perfect square greater than 668 is 676 (26^2). Therefore, √668 falls between 25 and 26.

 

Step 2: Apply the formula: (Given number - smaller perfect square) ÷ (Larger perfect square - smaller perfect square). Using the formula: (668 - 625) ÷ (676 - 625) = 43 ÷ 51 ≈ 0.843. Adding this to the smaller root: 25 + 0.843 = 25.843, so the square root of 668 is approximately 25.843.

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Common Mistakes and How to Avoid Them in the Square Root of 668

Students often make mistakes while finding square roots, such as forgetting about the negative square root or skipping steps in the long division method. Let's look at a few mistakes in detail.

Mistake 1

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Forgetting about the negative square root

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It is important to remind students that a number has both positive and negative square roots. However, we typically consider only the positive square root unless specified otherwise.

For example: √50 ≈ 7.07, but there is also -7.07.

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Square Root of 668 Examples

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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 √668?

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The area of the square is approximately 668 square units.

Explanation

The area of the square = side^2.

The side length is given as √668.

Area of the square = (√668)^2 = 668.

Therefore, the area of the square box is approximately 668 square units.

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Max, the Girl Character from BrightChamps

Problem 2

A square-shaped field measuring 668 square feet is built; if each of the sides is √668, what will be the square feet of half of the field?

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334 square feet

Explanation

We can divide the given area by 2 since the field is square-shaped.

Dividing 668 by 2 gives us 334.

So half of the field measures 334 square feet.

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Max, the Girl Character from BrightChamps

Problem 3

Calculate √668 × 5.

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Approximately 129.175

Explanation

The first step is to find the square root of 668, which is approximately 25.835.

The second step is to multiply 25.835 with 5.

So, 25.835 × 5 ≈ 129.175.

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Max, the Girl Character from BrightChamps

Problem 4

What will be the square root of (668 + 7)?

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The square root is approximately 26.

Explanation

To find the square root, first find the sum of (668 + 7).

668 + 7 = 675, and √675 ≈ 26.

Therefore, the square root of (668 + 7) is approximately ±26.

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Max, the Girl Character from BrightChamps

Problem 5

Find the perimeter of the rectangle if its length 'l' is √668 units and the width 'w' is 38 units.

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The perimeter of the rectangle is approximately 127.67 units.

Explanation

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

Perimeter = 2 × (√668 + 38)

≈ 2 × (25.835 + 38)

= 2 × 63.835

≈ 127.67 units.

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FAQ on Square Root of 668

1.What is √668 in its simplest form?

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2.Mention the factors of 668.

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3.Calculate the square of 668.

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4.Is 668 a prime number?

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5.668 is divisible by?

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

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7.How can cultural or local activities in Australia support learning Algebra topics such as Square Root of 668?

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8.How do technology and digital tools in Australia support learning Algebra and Square Root of 668?

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

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Professor Greenline from BrightChamps

Important Glossaries for the Square Root of 668

  • 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, which is √16 = 4.
     
  • Irrational number: An irrational number 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 in practical applications, hence called the principal square root.
     
  • Prime factorization: Breaking down a number into its basic prime factors. Example: The prime factorization of 668 is 2 x 2 x 167.
     
  • Decimal approximation: A close numerical value for an irrational number. Example: √668 ≈ 25.835.
Professor Greenline from BrightChamps

About BrightChamps in Australia

At BrightChamps, we believe algebra is more than symbols—it opens doors to endless opportunities! Our mission is to help children all over Australia gain important math skills, focusing today on the Square Root of 668 with a special emphasis on understanding square roots—in a lively, fun, and easy-to-grasp way. Whether your child is calculating the speed of a roller coaster at Luna Park Sydney, tracking cricket match scores, or managing their allowance for the newest gadgets, mastering algebra gives them the confidence to tackle everyday problems. Our interactive lessons make learning both simple and enjoyable. Since children in Australia learn in various ways, we adapt our approach to fit each learner’s style. From Sydney’s vibrant streets to the stunning Gold Coast beaches, BrightChamps brings math to life, making it relevant and exciting throughout Australia. 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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