Find the Smallest Number by Which the Following Number Must Be Divided to Obtain a Perfect Cube. 81 - CBSE Class 8 - Mathematics
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Find the smallest number by which the following number must be divided to obtain a perfect cube.
81 = 3 × 3 × 3 × 3
Here, one 3 is left which is not in a triplet.
If we divide 81 by 3, then it will become a perfect cube.
Thus, 81 ÷ 3 = 27 = 3 × 3 × 3 is a perfect cube.
Hence, the smallest number by which 81 should be divided to make it a perfect cube is 3.
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Solution Find the Smallest Number by Which the Following Number Must Be Divided to Obtain a Perfect Cube. 81 Concept: Cubes - Smallest Multiple that is a Perfect Cube.