Apple Numbers '08 - Manual (Page 243)

Chapter 12 Dictionary of Functions 243
LCM
The LCM function finds the least common multiple of the specified numbers.
Sometimes called the lowest or smallest common multiple, the least common multiple
is the smallest integer that is a multiple of the specified numbers.
LCM(number, [number, . . .])
 number: Zero or one or more positive numbers or numeric expressions, or references
to cells containing positive numbers or numeric expressions. Fractional parts are
ignored. Negative numbers are not allowed.
Examples
Given the following table:
LARGE(A2:E2, 1) returns 50, the largest value in the range.
LARGE(A2:E2, 2) returns 40, the second-largest value in the range.
LARGE(A2:E2, 5) returns 10, the fifth-largest value in the range.
LARGE(A2:E2) displays an error; you must specify n.
LARGE(A2:E2, 0) displays an error; n must be greater than 0.
LARGE(A2:E2, 6) displays an error; you can’t find the sixth out of five values.
Examples
LCM(2, 3) returns 6.
LCM(34, 68) returns 68.
LCM(30, 40, 60) returns 120.
LCM(30.25, 40.333, 60.5) returns 120 (the fractional parts are ignored).
LCM(2, -3) displays an error (negative numbers are not allowed).