LCM and GCF 20 30 15

Thursday, October 15, 2020

What is the LCM of 20-30 and 15? 
What is the GCF of 20-30 and 15?

The least common multiple ( LCM  ) of 20-30 and 15 = 120

The least common multiple is the smallest whole number will divide into evenly into all three numbers.

The greatest common factor ( GCF) of 20-30-and 15 = 5

The greatest common factor is the largest whole number that will divide into 20 and 30 and 15 evenly.

I use a factor tree and a chart to find the LCM and GCF

lcm 20 30 15

Once you have the prime factors for the LCM multiply all the factors together but if you have two or three of the same factors only use it once.
For the (GCF) find factors that you have triplets of them. If you have multiple factors multiply them together. If you don't have any the (GCF) is 1.

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