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SAI International School
                                                       Class VIII

     Mathematics

     Chapter 7 – Cubes and cube roots
     Worksheets
     Subtopic: Prime factorisation & estimation




     1) Which of these is the cube root of 125000?

            a) 25                        b) 50                 c) 250                d)500

           3
     2)(-4) =?
            a) 64                        b) 12                 c)(-12)               d) (-64)


     3)Which of these is a perfect cube?
                                                                              2
                                                                                    2
                                          3
                                                           6
                                                                2
                                                                          2
                                      3
                6
                    9
                                              4
                                                      4
            a) 3  × 5             b) 2  × 3  × 4       c) 2  × 5 × 11    d) 5  × 7  × 11
     4)It is known that 389017 is a perfect cube. Which of these could be its cube root?
            a) 33                        b) 37                 c) 67                 d) 73

     5)Find the cube root of 13824 by prime factorisation method.

     6) Find the cube root of 1296000 by Prime factorisation .

     7)What must be Multiplied with 225 to make it a perfect cube .

     8) Find the cube root of 389017 by estimation . (q no 4)
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