The LCM is used to convert unlike rational fraction to like fractions so that they can be added or subtracted. Any common multiple will do so the LCM is not that important. However, using the LCM will ensure that the numbers that you have to deal with are as small as they can be.
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The LCM is 78.
The LCM of 3 and 6 is 6 The LCM of 5 and 7 is 35. The LCM of 8 and 9 is 72. The LCM of 12 and 15 is 60.
The LCM of these numbers is 25y. LCM is Least Common Multiple.
LCM = 90
The LCM of these numbers is 900 . LCM is Least common multiple.