The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
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The LCM of 20, 32 and 84 is 3360.
lcm(20, 32) = 160
20 + 32 = 52 32 + 52 = 84 52 + 84 = 136
The LCM of 12, 84 is 84.
The LCM of 63 and 84 is 252.