183 LearnersLast updated on May 26th, 2025
Cube Root of 39
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 39 and explain the methods used.
What is the Cube Root of 39?
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 (3), and the exponent we use is â…“. In exponential form, ∛39 is written as 391/3. The cube root is just the opposite operation of finding the cube of a number.
For example: Assume ‘y’ as the cube root of 39, then y3 can be 39. Since the cube root of 39 is not an exact value, so we can write it as approximately 3.3912.
Finding the Cube Root of 39
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 39.
The common methods we follow to find the cube root are given below:
- Prime factorization method
- Approximation method
- Subtraction method
- Halley’s method
Cube Root of 39 Halley’s method
To find the cube root of a non-perfect number, we often follow Halley’s method. Since 39 is not a perfect cube, we use Halley’s method.
Let's find the cube root of 39 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 = 39; x = 3
∛a ≅ 3((33 + 2 × 39) / (2 × 33+ 39))
∛39 ≅ 3((27 + 2 × 39) / (2 × 27 + 39))
∛39 ≅ 3.387
The cube root of 39 is 3.3912
Common Mistakes and How to Avoid Them in the Cube Root of 39
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:
Mistake 1
Trying to find perfect cube roots for non-perfect cube numbers.
Children always try to calculate an exact whole number for the cube root of numbers like 39, which are not perfect cubes. For example: They assume that they would get an exact whole number for 39 like they get for 27(since 33=27). To avoid this error, memorize that some numbers don't have a perfect cube root, that is, cube root 39 is approximately 3.39.
Cube Root of 39 Examples:
Problem 1
Imagine you have a cube-shaped toy that has a total volume of 39 cubic centimeters. Find the length of one side of the box equal to its cube root.
Side of the cube = ∛39 = 3.38 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 3.38 units
Problem 2
A company manufactures 39 cubic meters of material. Calculate the amount of material left after using 12 cubic meters.
The amount of material left is 27 cubic meters.
Explanation
To find the remaining material, we need to subtract the used material from the total amount:
39 - 12 = 27 cubic meters.
Problem 3
A bottle holds 39 cubic meters of volume. Another bottle holds a volume 8 cubic meters. What would be the total volume if the bottles are combined?
The total volume of the combined bottles is 47 cubic meters
Explanation
Let’s add the volume of both bottles:
39 + 8 = 47 cubic meters.
Problem 4
Let’s say a substance in a chemical reaction has a concentration of 39 grams per cubic meter. Calculate the new concentration, if 5 grams per cubic meter are added to it.
The new concentration is 44 grams per cubic meter.
Explanation
To find the new concentration, add the increase in concentration to the original value:
39 + 5 = 44 grams per cubic meter.
Problem 5
When the cube root of 39 is multiplied by 2, calculate the resultant value. How will this affect the cube of the new value?
2 x 3.38= 6.76
The cube of 6.76= 308.8
Explanation
When we multiply the cube root of 39 by 2, it results in a significant increase in the volume because the cube increases exponentially.
FAQs on 39 Cube Root
1.Can we find the Cube Root of 39?
2.Why is Cube Root of 39 irrational?
3.Is it possible to get the cube root of 39 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?
6.How does learning Algebra help students in Thailand make better decisions in daily life?
7.How can cultural or local activities in Thailand support learning Algebra topics such as Cube Root of 39?
8.How do technology and digital tools in Thailand support learning Algebra and Cube Root of 39?
9.Does learning Algebra support future career opportunities for students in Thailand?
Important Glossaries for Cube Root of 39
- 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 x 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 x1/3, â…“ is the exponent which denotes the cube root of x.
- 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 39 is irrational because its decimal form goes on continuously without repeating the numbers.
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Jaskaran Singh Saluja
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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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