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Factor them.
2 x 3 x 7 = 42
2 x 7 x 7 = 98
Combine the factors, eliminating duplicates.
2 x 3 x 7 x 7 = 294, the LCM
LCM of 98 and 42 is 294.
The LCM is 1764.
LCM of 42 70 and 98 is 1470.
The LCM is: 4,704
The LCM is: 294
The LCM of 42 and 98 is 294
1176
It is: 294
It is: 588
For the values: 98, 42, 36 the LCM is: 1,764
Th LCM of 21 and 42 is: 42
2940