RS Aggarwal Class 8 Math Fourth Chapter Cubes and Cube Roots Exercise 4D Solution

RS Aggarwal Class 8 Math Fourth Chapter Cubes and Cube Roots Exercise 4D Solution

EXERCISE 4D

OBJECTIVE QUESTIONS

Tick (√) the correct answer in each of the following:

(1) Which of the following numbers is a perfect cube?

Ans: (C) 216

216 = 2 × 2 × 2 × 3 × 3 × 3 = (2 × 3)3 = 63

(2) Which of the following numbers is a perfect cube?

Ans: (b) 1331

1331 = 11 × 11 × 11 = (11)3

(7) By what least number should 648 be multiplied to get a perfect cube?

Ans: (c) 9

648 = 2 × 2 × 2 × 3 × 3 × 3 × 3.

Clearly, to make it a perfect cube, it must be multiplied by (3 × 3) = 9.

(8) By what least number should 1536 be divided to get a perfect cube?

Ans: (a) 3

1536 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3.

Clearly, to make it a perfect cube, it must be divided by 3.

(10) (0.8)3 = 0.8 × 0.8 × 0.8 = (c) 0.512


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