The smallest number by which 81 be divided to obtain a perfect cube is :
1
3
9
none of the above
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Finding prime factors of 81
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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The cube of -4 is:
16
12
-64
64
The smallest number by which 72 must be multiplied to obtain a perfect cube is:
2
4
6
Find the cube of 7.
Find the cube of 11.
