2. Find the smallest number by which each of the following numbers must be multipliet
 to obtain a perfect cube.
 (i) 243
 (ii) 256
 (m) 72
 (iv) 675
 (v) 100
 3. Find the smallest number by which each of the following numbers must be divided to
 obtain a perfect cube.
 (i) 81
 (i) 128
 (iii) 135
 (iv) 192
 (v) 704