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Quick Math Homework Help

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
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video lcm calculator
lcm calculator
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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.
Lowest common multiple calculator
Lowest Common Multiple Calculator
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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
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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
Lowest common multiple definition. The lowest common multiple or LCM, is the smallest positive integer that is divisible by two or more numbers. For example the lowest common multiple of 6 and 9 is 18, because it is the smallest positive integer both 6 and 9 will divide evenly into. What is the lowest common multiple of 3 and 4? The LCM is 12 because it is the lowest positive number both numbers will divide into.