Factor them.
2
2 x 7
5 x 5 x 7
Combine the factors, eliminating duplicates.
2 x 5 x 5 x 7 = 350, the LCM
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You need at least two numbers to find an LCM. If that's 2 and 14, the LCM is 14.
The LCM of 2, 14, and 7 is 14.2x7=1414x1=14
Both 2 and 14 are multiples of 14. It isn't possible to have a multiple smaller than the largest number. The LCM is 14.
You need at least two numbers to find an LCM. If that's 2, 14 and 82, the LCM is 574.
If you mean: 49, 28 and 14 then the LCM is 196