4800 because 80:2.2.2.2.5 and 120:2.2.2.3.5 so then the LCM factorization is 2.2.2.2.2.2.3.5.5! when you multiply them it comes to 4800
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Write out the multiples of each: 30, 60, 90, 120 40, 80, 120. 120 is the first that appears in both and this is your LCM
The answer is 120.It is: 120
The LCM is: 120
The LCM is: 120
The LCM is: 120