To find the LCM: write in 2 rows multiples of 6 (top row) and multiples of 9 (bottom row) and find the same number in both rows. 18 is in both rows, so 18 is the LCM of 6 and 9.
6.12.18.24
9.18.27.36
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To find the LCM of a number in this case 6 and 9 you find all of their multiples that they share in this caseThe multiples of 6 are 2,3,6
You need at least two numbers to find an LCM. If that's 6 and 9, the LCM is 18.
The LCM is 306.
The LCM is 90.
The LCM is 18.