The lowest common multiple is useful in doing fraction addition. If you use any common multiple then you will need to do more reducing in the answers.
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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.