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Question
Find the smallest number by which of the following number must be multiplied to obtain a perfect cube.
675
Solution
| 3 | 675 |
| 3 | 225 |
| 3 | 75 |
| 5 | 25 |
| 5 | 5 |
| 1 |
675 = 3 × 3 × 3 × 5 × 5
Here, two 5s are left, which are not in a triplet. To make 675 a cube, one more 5 is required.
Then, we obtain
675 × 5 = 3 × 3 × 3 × 5 × 5 × 5 = 3375 is a perfect cube.
Hence, the smallest natural number by which 675 should be multiplied to make it a perfect cube is 5.
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