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### 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

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## 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    ## 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