**Step 1:**Find common prime factor (common to at least 2 of the given numbers)

**Step 2:**Divide numbers that can be divided by this factor and write the quotient in the second line

**Step 3:**Write the numbers that is not divisible by this factor, as it is in second line

**Step 4:**Repeat step 1 through 3 until there are no common prime factors

**Step 5:**Multiply the remaining numbers with the prime factors identified in step 1 and used in step 2*This is most practical method and is quickest of all discussed above. Further, this can be used for finding LCM of any number of terms as well as any number large and small. Learning the method is the key.*

**Example:***Find the LCM of 24, 32, 60, and 90*

*Step 1: 3 is common to 24, 60, and 90 but not 32*

*Step 2: Divide 24, 60 and 90 by 3 as below*

*Step 3: Since 32 is not divisible by 3, it was divided by 1*

*Step 4: When we repeat step 1 through 3 we should get below*

*Step 5: Multiply all the prime factors used with the numbers remaining in last row*

*LCM = 2 x 2 x 2 x 3 x 5 x 4 x 3 =*

**1440**