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The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 7, 9, and 13 is 819.
The GCF is: 1
1 x 819, 3 x 273, 7 x 117, 9 x 91, 13 x 63, 21 x 39 = 819
819 is DCCCXIX
819 ÷ 9 = 91