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Mathematics

The smallest number by which 81 be divided to obtain a perfect cube is :

  1. 1

  2. 3

  3. 9

  4. none of the above

Cube & Cube Roots

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Answer

Finding prime factors of 81

The smallest number by which 81 be divided to obtain a perfect cube is : Cubes and Cube Roots, Concise Mathematics Solutions ICSE Class 8.

81 = (3 x 3 x 3) x 3

Since the prime factor 3 is not in pair.

The given number should be divided by 3.

Hence, option 2 is the correct option.

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