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## Answers

In the prime factors, only 2 and 3 are present. 2 form a triplet (there are three 2s), while there are four 3s.To be a perfect cube, all prime factors should be in multiples of 3. Therefore, to make 648 a perfect cube, it has to be multiplied by 3 × 3 =

**(so that there will be six 3s in total).**

__9__P.S. You can also multiply by , which is smaller or by , which is even smaller, but the officially accepted answers are integers, unless they specify otherwise.

648=2*2*2*3*3*3*3

To make it a perfect cube, either it has to be multiplied by 9 or 1/3

To make it a perfect cube, either it has to be multiplied by 9 or 1/3