Elementary Math (K-6th) Tutorial
Least Common Multiple
Intro
Find the LCM of 6 and 4 using prime factorization.
Let’s find multiples of these two numbers.
6:6,12,18,24,30,….
4:4,8,12,32,40,….
Sample Problem
Find the LCM of 6 and 4 using prime factorization.
Solution
Find the first few multiples of the two numbers as follows:
6: 6 , 12 , 18 , 24 , 30 ,…
4: 4 , 8 , 12 , 32 , 40 ,…
The lowest multiple that is common to 6 and 4 is 12. So the LCM of 6 and 4 is 12.
The above method works well for small numbers only.
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