The highest common multiple is an infinite number and not very practical for everyday use.
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Since 9 and 11 share no common factors (other than 1) the lowest common multiple will be the product of the two numbers, i.e. 99.
792
LCM(9, 11, 14) = 1386.
LCM(4, 11, 9) = 396
Least Common Multiple (LCM) for 11 14 9 is 1,386.