New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 8 Squares and Square Roots, Cubes and Cube Roots Self Practice 3E Solution
(1) Find the cubes of the following numbers.
(a) 12
(b) 15
(c) 30
(d) 200
(e) -3/7
(f) 11/8
(g) 0.4
(h) 0.9
(i) 0.02
(j) -20/9
SOLUTION Number 1:
(2) Which of the following numbers are perfect cubes?
(a) 125
(b) 2197
(c) 832
(d) 2744
(e) 2000
(3) What is the smallest natural number by which the following should be multiplied so that they become perfect cubes?
(a) 36
(b) 121
(c) 392
(4) What is the smallest natural number by which the following numbers should be devided so that they become perfect cubes?
(a) 54
(b) 625
(c) 1536
(d) 7000
SOLUTION Number 2, 3 & 4:
(5) Find the cube root of each of the following numbers by prime factorisation method.
(a) 8
(b) 216
(c) 1728
(d) -4~17/27
(e) 0.027
(f) -.216
(g) 0.001331
(h) 0.002744
SOLUTION Number 5:
Very useful