105
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840. 15 = 3 x 5 21 = 3 x 7 40 = 23 x 5 lcm = 23 x 3 x 5 x 7 = 840
3 x 5 = 15 3 x 7 = 21 Combine the factors, eliminating duplicates. 3 x 5 x 7 = 105, the LCM
3 x 5 = 15 3 x 7 = 21 Combine the factors, eliminating duplicates. 3 x 5 x 7 = 105, the LCM
56 = 2^3 * 7 96 = 2^5 * 3 LCM = 2^5 * 3 * 7 = 32 * 21 = 672
The LCM is 252.