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838 LearnersLast updated on August 5, 2025
Cube Root of 5
What Is the Cubic Root of 5?
The cube root of 5 is 1.70997594668. The cube root of 5 is expressed as ∛5 in radical form, where the “ ∛ “ sign is called the “radical” sign. In exponential form, it is written as (5)⅓. If “m” is the cube root of 5, then, m3=5. Let us find the value of “m”.
Finding the Cubic Root of 5
The cube root of 5 is expressed as ∛5 as its simplest radical form. We can find cube root of 5 through a method, named as, Halley’s Method. Let us see how it finds the result.
Cubic Root of 5 By Halley’s Method
Now, what is Halley’s Method?
It is an iterative method for finding cube roots of a given number N, such that, x3=N, where this method approximates the value of “x”.
Formula is ∛a≅ x((x3+2a) / (2x3+a)), where
a=given number whose cube root you are going to find
x=integer guess for the cubic root
Let us apply Halley’s method on the given number 5.
Step 1: Let a=5. Let us take x as 1, since, 13=1 is the nearest perfect cube which is less than 5.
Step 2: Apply the formula. ∛5≅ 1((13+2×5) / (2(1)3+5))= 11/7=1.571
Hence, 1.571 is the approximate cubic root of 5.
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Common Mistakes and How to Avoid Them in the Cubic Root of 5
some common mistakes with their solutions are given here:
Mistake 1
For arithmetic operations inside a cube root radical, like that of ∛(5+3), students often write it as ∛5+3, where the meaning changes.
It is advisable to put brackets after cube root radical for a better
understanding of any arithmetic operations.
Mistake 2
Students forget the concept of cube roots often, by not understanding the definition.
This happens because of uncleared understanding of cube roots and the methods to find it.
Mistake 3
For large non-perfect cubes, students often estimate wrongly and leave it in a wrong result.
Keep the methods of finding cube roots in front whenever attempting large non-perfect cubes.
Mistake 4
Students often rely on memorizing rather than understanding concepts of cube root.
Memorizing is not the solution when it comes to complex problems. So understanding the methods of finding cube roots is advisable.
Mistake 5
Not checking for perfect cubes, like that of 64, before using calculators for approximation.
Try to remember which are the perfect cubes, at least from 1 to 100.
Cube Root of 5 Examples
Problem 1
The length, breadth and height of a cuboid is 1 unit, 1.5 unit, and 1.8 unit respectively. Find its volume, also find the measure of a side of a cube whose volume is 5 cubic units.
Volume of a cuboid = length × breadth × height = 1 × 1.5 × 1.8 cubic units = 2.7 cubic units.
Given, Volume of a cube = 5 cubic units
⇒ side × side × side = 5 cubic units
⇒ side = ∛5
⇒ side = 1.709 units
Answer: Volume of the cuboid = 2.7 cubic units
Side length of the cube = 1.709 units
Explanation
Applied the formula and concept of the volume of a cuboid and cube and solved.
Problem 2
If y = ∛5, find y³/ y⁶
y=∛5
⇒ y3/y6
= (∛5)3 / (∛5)6
⇒ y3/y6= 5/ (5)2
= 1/5
Answer: 1/5
Explanation
(∛5)3=(51/3)3=5, and ∛5)6=(51/3)6=(5)2. Using this, we found the value of y3/y6.
Problem 3
Multiply ∛5 × ∛8 × ∛27
∛5×∛8× ∛27
= 1.709×2×3
= 10.254
Answer: 10.254
Explanation
We know that the cubic root of 8 is 2 and that of 27 is 3, hence multiplying.
Problem 4
What is ∛(5⁶) ?
∛(56)
= ((5)6))1/3
=(5)2
= 25
Answer: 25
Explanation
We solved and simplified the exponent part first using the fact that, ∛5=(5)⅓, then solved.
Problem 5
Find ∛5 / 1709.
(∛5) / 1709
= 1.709 /1709
=0.001
Answer: 0.001
Explanation
Simplified the expression, and found out the result.
FAQs on Cube Root of 5
1.How is ∛2 solved?
2.How do you simplify √5?
3.How to find the cube root of 5 without a calculator?
4.What is the value of √5?
5.Is 5 a perfect cube root?
Important Glossaries for Cube Root of 5
- Integers - Integers can be a positive natural number, negative of a positive number, or zero. We can perform all the arithmetic operations on integers. The examples of integers are, 1, 2, 5,8, -8, -12, etc.
- Whole numbers - The whole numbers are part of the number system, which includes all the positive integers from 0 to infinity.
- Square root - The square root of a number is a value “y” such that when “y” is multiplied by itself → y × y, the result is the original number.
- Polynomial - It is an algebraic expression made up of variables like “x” and constants, combined using addition, subtraction, multiplication, or division, where the variables are raised to whole number exponents.
- Approximation - Finding out a value which is nearly correct, but not perfectly correct.
- Iterative method - This method is a mathematical process which uses an initial value to generate further and step-by-step sequence of solutions for a problem.
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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.
