Q. 4 A5.0( 1 Vote )

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Answer :

81

Prime Factorization:



81 = 3 × 3 × 3 × 3


= 33 × 3


There is only one 3.


81 is not a perfect cube.


Since in factorization, 3 appear only one time, we should divide the number 81 by 3.


81 ÷ 3 = 27


= 3 × 3 × 3


= 33 which is a perfect cube


The smallest number by which the number 81 must be divided to obtain a perfect cube is 3.


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