Question:
Tick (✓) the correct answer
By what least number should 648 be multiplied to get a perfect cube?
(a) 3
(b) 6
(c) 9
(d) 8
Solution:
(c) 9.png)
$648=2 \times 2 \times 2 \times 3 \times 3 \times 3 \times 3=(2)^{3} \times(3)^{3} \times 3$
Therefore, to get a perfect cube, we need to multiply 648 by 9 , i.e. $(3 \times 3)$.