132 LearnersLast updated on May 26th, 2025
Cube Root of 915
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 915 and explain the methods used.
What is the Cube Root of 915?
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, ∛915 is written as 915(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 915, then y3 can be 915. Since the cube root of 915 is not an exact value, we can approximate it as approximately 9.736.
Finding the Cube Root of 915
Finding the cube root of a number involves identifying the number that must be multiplied three times to result in the target number. Now, we will go through the different ways to find the cube root of 915. 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 cube number, we often use Halley’s method. Since 915 is not a perfect cube, we will use Halley’s method.
Cube Root of 915 by Halley’s Method
Let's find the cube root of 915 using Halley’s method.
The formula is ∛a ≅ x((x3+2a) / (2x3+a))
where: a = the number for which the cube root is being calculated
x = the nearest perfect cube
Substituting, a = 915;
x = 9
∛a ≅ 9((93 + 2 × 915) / (2 × 93 + 915))
∛915 ≅ 9((729 + 1830) / (1458 + 915))
∛915 ≅ 9.736
The cube root of 915 is approximately 9.736.
Common Mistakes and How to Avoid Them in the Cube Root of 915
Finding the perfect cube of a number without any errors can be a difficult task for students. This happens for many reasons. Here are a few mistakes students commonly make and the ways to avoid them:
Mistake 1
Trying to find perfect cube roots for non-perfect cube numbers.
Children often try to calculate an exact whole number for the cube root of numbers like 915, which are not perfect cubes.
For example, they assume they would get an exact whole number for 915 like they get for 1000 (since ∛1000 = 10). To avoid this error, memorize that some numbers don't have a perfect cube root; the cube root of 915 is approximately 9.736.
Cube Root of 915 Examples:
Problem 1
Imagine you have a cube-shaped container that has a total volume of 915 cubic centimeters. Find the length of one side of the container, which is equal to its cube root.
Side of the cube = ∛915 = 9.736 units
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 9.736 units.
Problem 2
A company manufactures 915 cubic meters of material. Calculate the amount of material left after using 300 cubic meters.
The amount of material left is 615 cubic meters.
Explanation
To find the remaining material, we need to subtract the used material from the total amount:
915 - 300 = 615 cubic meters.
Problem 3
A tank holds 915 cubic meters of liquid. Another tank holds a volume of 150 cubic meters. What would be the total volume if the tanks are combined?
The total volume of the combined tanks is 1065 cubic meters.
Explanation
Let’s add the volume of both tanks: 915 + 150 = 1065 cubic meters.
Problem 4
When the cube root of 915 is multiplied by 2, calculate the resultant value. How will this affect the cube of the new value?
2 × 9.736 = 19.472 The cube of 19.472 = 7384.4
Explanation
When we multiply the cube root of 915 by 2, it results in a significant increase in the volume because the cube increases exponentially.
Problem 5
Find ∛(500+415).
∛(500+415) = ∛915 ≈ 9.736
Explanation
As shown in the question ∛(500+415), we can simplify that by adding them. So, 500 + 415 = 915. Then we use this step: ∛915 ≈ 9.736 to get the answer.
FAQs on 915 Cube Root
1.Can we find the Cube Root of 915?
2.Why is Cube Root of 915 irrational?
3.Is it possible to get the cube root of 915 as an exact number?
4.Can we find the cube root of any number using prime factorization?
5.Is there any formula to find the cube root of a number?
Important Glossary for Cube Root of 915
- 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, 3 × 3 × 3 = 27, therefore, 27 is a perfect cube.
- Exponent: The exponent form of the number denotes the number of times a number can be multiplied by itself. In 915(1/3), 1/3 is the exponent which denotes the cube root.
- Radical sign: The symbol that is used to represent a root is expressed as (∛).
- Irrational number: Numbers that cannot be put in fractional forms are irrational. For example, the cube root of 915 is irrational because its decimal form goes on continuously without repeating.
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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.
