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The LCM of 8, 42, and 84 = 168
8 factors into 2^3
42 factors into 2*3*7
84 factors into 2^2 * 3 * 7
The LCM needs to have 2^3 to be divisible by 8 (which includes the 2 and the 22 of the other numbers) as well as a 3 and a 7 in its factors to accommodate the 42 and the 84.
Therefore, the LCM is 23 * 3 * 7 = 168
8 factors into 2^3
42 factors into 2*3*7
84 factors into 2^2 * 3 * 7
The LCM needs to have 2^3 to be divisible by 8 (which includes the 2 and the 22 of the other numbers) as well as a 3 and a 7 in its factors to accommodate the 42 and the 84.
Therefore, the LCM is 23 * 3 * 7 = 168
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