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493 LearnersLast updated on August 5, 2025
Cube Root of 40
We will learn the cube root concept to use it on other mathematical topics like algebra, mensuration, geometry, trigonometry, etc. So, it is as important as learning square roots. Let us now see how we can obtain the cube root value of 40, and its examples.
What Is the Cube Root of 40?
The cube root of 40 is the value which, when multiplied by itself three times (cubed), gives the original number 40. The cube root of 40 is 3.41995189335. The cube root of 40 is expressed as โ40 in radical form, where the “ โ ” sign” is called the “radical” sign. In exponential form, it is written as (40)โ
. If “m” is the cube root of 40, then, m3=40. Let us find the value of “m”.
Finding the Cube Root of 40
We can find cube root of 40 through a method, named as, Halley’s Method. Let us see how it finds the result.
Cube Root of 40 By Halleyโs 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 โa≅ 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 48.
Step 1: Let a=40. Let us take x as 3, since, 33=27 is the nearest perfect cube which is less than 40.
Step 2: Apply the formula. โ40≅ 3((33+2×40) / (2(3)3+40))= 3.41…
Hence, 3.41… is the approximate cubic root of 40.
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Common Mistakes and How to Avoid Them in the Cube Root of 40
Understanding common misconceptions or mistakes can make your calculations error free. So let us see how to avoid those from happening.
Mistake 1
For โ40, students can make error in the important part of prime factorization.
Mistake 2
Applying exponent rules incorrectly when finding cube roots.
โ40 is not same as 403. โ40 = 3.41… and 403=64000.
Mistake 3
For large non-perfect cubes, students frequently estimate wrongly and leave it with a wrong result.
Keep the methods of finding cube roots in front whenever attempting large non-perfect cubes.
Mistake 4
Students typically 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
Misapply the cube root property like when asked to solve โ(40)3, students might do as โ(40×3)
Clear the concepts again and again if they don’t understand, where to do what. โ(40)3≠โ(40×3). โ(40)3= 40
Cube Root of 40 Examples
Problem 1
Find ((โ80/ โ40) ร (โ80/ โ40) ร (โ80/ โ40))
(โ80/ โ40) × (โ80/ โ40) × (โ80/ โ40)
= (โ80× โ80× โ80) / (โ40× โ40× โ40)
=((80)โ
)3/ ((40)โ
)3
=80/40
=2
Answer: 2
Explanation
We solved and simplified the exponent part first using the fact that, โ80=(80)โ
and โ40=(40)โ
, then solved.
Problem 2
If y = โ40, find yยณ/ yโถ
Solution: y=โ40
⇒ y3/y6= (โ40)3 / (โ40)6
⇒ y3/y6= 40/ (40)2= 1/40
Answer: 1/40
Explanation
(โ40)3=(401/3)3=40, and โ(40)6=(401/3)6=(40)2. Using this, we found the value of y3/y6.
Problem 3
Multiply โ40 ร โ64 ร โ125
โ40 × โ64 × โ125
= 3.41 × 4 ×5
= 68.2
Answer: 68.2
Explanation
We know that the cubic root of 64 is 4 and the cubic root of 125 is 5, hence multiplying โ125, โ64 and โ48.
Problem 4
What is โ(100)โถ+ โ(40)โถ ?
โ(1006)+ โ(40)6
= ((100)6))1/3 +((40)6)1/3
=(100)2 + (40)2= 10000 + 1600
Answer: 11600
Explanation
We solved and simplified the exponent part first using the fact that, โ100=(100)โ
and โ40=(40)โ
, then solved.
Problem 5
Find โ(40+(-8)+(-5)).
โ(40-8-5)
= โ27
=3
Answer: 3
Explanation
Simplified the expression, and found out the cubic root of the result.
FAQs on 40 Cube Root
1.How to solve โ40 ?
2.What is the square of 40?
3.What does 3โ27 mean?
4.What is the square root of 40 in the simplest form?
5.How do I calculate โ47?
Important Glossaries for Cube Root of 40
- Cube root properties - The features when cube root is applied to any number. Those are:
1) The cube root of all odd numbers is an odd number. The same applies for even numbers also, that is, the cube of any even number is even.
2) The cube root of a negative number is also negative.
3) If the cube root of a number is a whole number, then that original number is said to be perfect cube
- Irrational Numbers - Numbers which cannot be expressed as m/n form, where m and n are integers and n not equal to 0, are called Irrational numbers.
- Square root -The square root of a number is a number which when multiplied by itself produces the original number, whose square root is to be found out.
- 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 near to the correct answer, but not perfectly correct.
- Iterative method - This method is a mathematical process which uses an initial value to generate a further sequence of solutions for a problem, step-by-step.
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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.
