It is: 105
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The LCM of 7 21 35 is 105
For 70, 35, 21, 14 the LCM is: 210
The LCM of 5 and 7 is 35. LCM stands for Least Common Multiple, or Lowest Common Multiple.
Its so easy. I can answer it in 1 second. The LCM is 105 (66) (51)
Note that 21 x 2 = 42, so we really only need to look at 35 and 42. So 7 x 5 = 35, and 7 x 6 = 42. There is a common factor of 7. So we have 7 x 5 x 6 = 210 is the LCM.