Procedure - Find the Least Common Multiple (LCM), Math, Class 9 Class 9 Notes | EduRev

Mathematics (Maths) Class 9

Created by: Indu Gupta

Class 9 : Procedure - Find the Least Common Multiple (LCM), Math, Class 9 Class 9 Notes | EduRev

The document Procedure - Find the Least Common Multiple (LCM), Math, Class 9 Class 9 Notes | EduRev is a part of the Class 9 Course Mathematics (Maths) Class 9.
All you need of Class 9 at this link: Class 9

Procedure:

1. Prime factorisation method:

  • Factorise each number into its prime factors.
  • Count the number of times each prime factor appears in factorisation.
  • For each and every prime number take the highest power of prime factor.
  • The LCM of number is the multiple of factors having highest power.

ex.  Find the LCM of 16,20.

      16 = 2*2*2*2 = 2^4

      20 = 2*2*5  = 2²*5

LCM of 16 and 20 = 24 * 5 = 2*2*2*2*5= 80

2. Grid method:

  • Create a grid and write the numbers on top of grid separated by comma
    |  4, 6
    |
  • Divide the numbers with the smallest common prime factor.
    2 |  4, 6
    |  2, 3
  • Repeat the process until no more common factors exist.

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