moomoomath logo header
lime green horizontal line
Welcome to MooMooMath
Quick Math Homework Help
study skills A teachers secret guide to your best grades
Master the 7 pillars of school success that I have learned from 25 years of teaching.

Improve your grades and lower your stress

Find the lowest common multiple for 15 and 20.

This video works several example problems showing how to find the Least Common Multiple (LCM) of Polynomials






























Lowest Common Multiple Calculator

Step 1.Write out a list of multiples for each number.
Step 3. The number found on each list will be your LCM or Lowest Common Multiple in this example it is 60
Step 2. Cross out numbers that are not found on each list.
​20

40

60

80

100

120

Common multiple calculator

Find the  lowest common multiple ( lcm ) of 5 and 6

Prime factorization of 5 = 10 15 20 25 30 

Prime factorization of 6 = 12 18 24 30

30 = the LCM
Find the  lowest common multiple ( lcm ) of 4 ,12 , and 30

Prime factorization of 4= 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60

Prime factorization of 12= 24, 36, 48 ,60

Prime factorization 3060 


60= the LCM
black line
horizontal black line
horizontal black line
horizontal black line

How do you find the LCM of polynomials?

Follow these steps to find the LCM of polynomials

1. Factor

2. Write each factor,not duplicating the "common" ones

3. Multiply these factors together



For example: Find the LCM of  4x^2  and 10xy

Step 1. Factor 4x^2 = 2*2 x*x       10xy = 2*5 x*y

Step 2. Write down each factor and not duplicate common ones
                 2*2*5*x*x*y

Step 3. Multiply these together   20x^2y
These problems are difficult to explain verbally. I feel watching someone work several examples will help understanding.
Common Core Standard: 6.NS.B.4 6th Grade Math