MATHEMATICS for class 5

 Factors and multiples :

          1.) Find factors for 18:-

          Ans: First write the possibility of getting 18 in all tables  

For eg :- 1*18=18 

                2*9=18 

                3*6=18 

        Then the factors of 18 are 1,2,3,6,9 and 18 

          2.) Find multiples of 6 :-

      Ans: write all the tables of 6 in order 

              i.e 6,12,18,24,30,36,42,48,54,60

         3.) Find the  common factors of 24 and 30:-

       Ans: Firstly Factors of 24 are :-

             1*24=24

             2*12=24

             3*8=24

             4*6=24

            Secondly Factors of 30 :- 

            1*30=30

             2*15=30

             3*10 =30 

             5*6=30 

Here common Factors of 24 and 30 are 1,2,3,6 

           4.)  Find common  Multiples of 5 and 10 

            Ans: First multiples of 5 are: 

       5,10,15,20,25,30,35,40,45,50,55,60

                  Second multiples of 10 are: 

        10,20,30,40,50,60,70,80,90,100

So common Multiples of 5and 10 are 

         10,20,30,40,50,60