The answer is 42. Just keep doing multiples of each number and keep going until all numbers reach the same factor.
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LCM of 2, 3 and 7 is 42
lcm(2, 3, 4, 5, 6, 7, 8) = 840
The LCM is: 6,930
The LCM of 23 and 7 is 161. The LCM of 2, 3 and 7 is 42.
The LCM of 12, 18, and 42 is 252 2 x 2 x 3 = 12 2 x 3 x 3 = 18 2 x 3 x 7 = 42 2 x 2 x 3 x 3 x 7 = 252, the LCM