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SAI INTERNATIONAL SCHOOL


                                                          Class: VI

                                                    Home Prac ce 5.2

                                                  SUBJECT: Mathema cs

                    CH: 5 PRIME TIME

                    SUBTOPIC:  Prime Factorisa on

                       1.  The prime factorisa on of a number has one 2, two 3s, and one 11.
                          What is the number?
                       2.  Find three prime numbers, all less than 30, whose product is 1955.
                       3.  What is the smallest number whose prime factorisa on has:

                          a.  three different prime numbers? b. four different prime numbers?
                       4.  Find the prime factorisa ons of the following numbers: 64, 104, 105.
                       5.  Are the following pairs of numbers co-prime? Guess first and then use
                          prime factorisa on to verify your answer.
                           a. 30 and 45        b. 343 and 216.
                       6.  State true or false: Any two prime numbers are co-prime? Jus fy your
                          answer by giving examples.

                       7.  Is the first number divisible by the second? Use prime factorisa on. a.
                          225 and 27.
                       8.  The first number has prime factorisa on 2 × 3 × 7 and the second
                          number has prime factorisa on 3 × 7 × 11. Are they co-prime? Does one
                          of them divide the other? Jus fy your answer.
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