Cube Root of 315
2026-02-28 23:11 Diff
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Last updated on August 5, 2025

A number we multiply by itself three times to get the original number is its cube root. It has various uses in real life, such as finding the volume of cube-shaped objects and designing structures. We will now find the cube root of 315 and explain the methods used.

What is the Cube Root of 315?

We have learned the definition of the cube root. Now, let’s learn how it is represented using a symbol and exponent. The symbol we use to express the cube root is the radical sign (∛), and the exponent we use is ⅓. In exponential form, ∛315 is written as 315^(1/3). The cube root is just the opposite operation of finding the cube of a number. For example: Assume ‘y’ as the cube root of 315, then y^3 can be 315. Since the cube root of 315 is not an exact value, we can write it as approximately 6.8752.

Finding the Cube Root of 315

Finding the cube root of a number is to identify the number that must be multiplied three times resulting in the target number. Now, we will go through the different ways to find the cube root of 315. The common methods we follow to find the cube root are given below:

  • Prime factorization method
  • Approximation method
  • Subtraction method
  • Halley’s method

To find the cube root of a non-perfect number, we often follow Halley’s method. Since 315 is not a perfect cube, we use Halley’s method.

Cube Root of 315 by Halley’s method

Let's find the cube root of 315 using Halley’s method

The formula is ∛a ≅ x((x^3 + 2a) / (2x^3 + a)) where:

a = the number for which the cube root is being calculated

x = the nearest perfect cube

Substituting, a = 315;

x = 7

∛a ≅ 7((7^3 + 2 × 315) / (2 × 7^3 + 315)) ∛315 ≅ 7((343 + 2 × 315) / (2 × 343 + 315)) ∛315 ≅ 6.8752

The cube root of 315 is approximately 6.8752

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Common Mistakes and How to Avoid Them in the Cube Root of 315

Finding the perfect cube of a number without any errors can be a difficult task for the students. This happens for many reasons. Here are a few mistakes the students commonly make and the ways to avoid them:

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Problem 1

Imagine you have a cube-shaped garden plot that has a total volume of 315 cubic meters. Find the length of one side of the plot equal to its cube root.

Okay, lets begin

Side of the cube = ∛315 = 6.8752 meters

Explanation

To find the side of the cube, we need to find the cube root of the given volume.

Therefore, the side length of the cube is approximately 6.8752 meters.

Well explained 👍

Problem 2

A company receives 315 cubic meters of soil. Calculate the amount of soil left after using 100 cubic meters.

Okay, lets begin

The amount of soil left is 215 cubic meters.

Explanation

To find the remaining soil, we need to subtract the used soil from the total amount: 315 - 100 = 215 cubic meters.

Well explained 👍

Problem 3

A tank holds 315 cubic meters of water. Another tank holds a volume of 85 cubic meters. What would be the total volume if the tanks are combined?

Okay, lets begin

The total volume of the combined tanks is 400 cubic meters.

Explanation

Explanation: Let’s add the volume of both tanks: 315 + 85 = 400 cubic meters.

Well explained 👍

Problem 4

When the cube root of 315 is multiplied by 3, calculate the resultant value. How will this affect the cube of the new value?

Okay, lets begin

3 × 6.8752 = 20.6256 The cube of 20.6256 = approximately 8,784.53

Explanation

When we multiply the cube root of 315 by 3, it results in a significant increase in the volume because the cube increases exponentially.

Well explained 👍

Problem 5

Find ∛(150 + 165).

Okay, lets begin

∛(150 + 165) = ∛315 ≈ 6.8752

Explanation

As shown in the question ∛(150 + 165), we can simplify that by adding them.

So, 150 + 165 = 315.

Then we use this step: ∛315 ≈ 6.8752 to get the answer.

Well explained 👍

FAQs on 315 Cube Root

1.Can we find the Cube Root of 315?

No, we cannot find the cube root of 315 exactly as the cube root of 315 is not a whole number. It is approximately 6.8752.

2.Why is Cube Root of 315 irrational?

The cube root of 315 is irrational because its decimal value goes on without an end and does not repeat.

3.Is it possible to get the cube root of 315 as an exact number?

No, the cube root of 315 is not an exact number. It is a decimal that is about 6.8752.

4.Can we find the cube root of any number using prime factorization?

The prime factorization method can be used to calculate the cube root of perfect cube numbers, but it is not the right method for non-perfect cube numbers. For example, 2 × 2 × 2 = 8, so 8 is a perfect cube.

5.Is there any formula to find the cube root of a number?

Yes, the formula we use for the cube root of any number ‘a’ is a^(1/3).

Important Glossaries for Cube Root of 315

  • Cube root: The number that is multiplied three times by itself to get the given number is the cube root of that number.
  • Perfect cube: A number is a perfect cube when it is the product of multiplying a number three times by itself. A perfect cube always results in a whole number. For example: 2 × 2 × 2 = 8, therefore, 8 is a perfect cube.
  • Exponent: The exponent form of the number denotes the number of times a number can be multiplied by itself. In a^(1/3), ⅓ is the exponent which denotes the cube root of a.
  • Radical sign: The symbol that is used to represent a root which is expressed as (∛).
  • Irrational number: The numbers that cannot be put in fractional forms are irrational. For example, the cube root of 315 is irrational because its decimal form goes on continuously without repeating the numbers.

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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.