Question

By which least number 128 be multipllied to obtain a number which is a perfect cube?
A. 9
B. 2
C. 8
D. 4​

Answer 1

B. 2

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Answer 2

First, we'll have to factorise 128 by prime factorisation.

128 = 2 x 2 x 2 x 2 x 2 x 2 x 2

If a number is a perfect cube, it is the product of the perfect cubes of prime numbers.

Here, 1 number is left uncommon(2)

To make it a cube, we will have to multiply it by 2 more of the same number, that is by 2 x 2

2 x 2 = 4

Your answer is

D) 4.