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Ambar Mitra Lowest Common Multiple by Factorization What is “Lowest Common Multiple” (LCM)? Let's say we have two numbers, 8 and 14. The multiples of 8 are 8 , 16 , 24 , 32 , 40 , 48 , 56 , 64 , 72 , 80 The multiples of 14 are 14 , 28 , 42 , 56 , 70 , 84 , 98 , 112 , 126 , 140 We find that the lowest number that is common in these two lists is 56. The Lowest Common Multiple of 8 and 14 is 56 Determining the LCM Example-1: Find LCM of 8 and 14 Write all factors of 8 : 2 , 2 , 2 Write all factors of 14 : 2 , 7 Make combined list of factors, including the common factors (blue highlight) only once: 2,2,2,7 Multiply the factors to get LCM = 56 Example-2: Find LCM of 18 and 27 Write all factors of 18 : 2, 3 , 3 Write all factors of 14 : 3 , 3 , 3 Make combined list of factors, including the common factors (blue and orange highlights) only once: 2,3,3,3 Multiply the factors to get LCM = 54