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To determine the LCM of a set of numbers, firstly convert each number into its prime factors. 240 = 2 x 2 x 2 x 2 x 3 x 5 = 24 x 3 x 5 144 = 2 x 2 x 2 x 2 x 3 x 3 = 24 x 32 The LCM is the product of the highest power of each prime factor. The LCM of 240 and 144 is 24 x 32 x 5 = 720.
In terms of whole numbers, the factor pairs of 720 are: 1 x 720 2 x 360 3 x 240 4 x 180 5 x 144 6 x 120 8 x 90 10 x 72 12 x 60 15 x 48 16 x 45 18 x 40 20 x 36 24 x 30
3 x 4 x 12 = 144 6 x 2 x 12 = 144 12 x 1 x 12 = 144 6 x 6 x 4 = 144
144 x 144 = 20,736
180*4=720