420
Prime Factorization of:
42 =...2 * 3 * 7
70 =...2 .....* 7 * 5
84 =...2 * 3 * 7......* 2
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LCM = 2 * 3 * 7 * 5 * 2 = 420
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Whenever one number is a multiple of the other, the LCM is the larger number and the GCF is the smaller number. The difference is 42.
2940
The Least Common Multiple (LCM) for 70 136 is 4,760.
The LCM of 30, 42, and 70 is 210
2 x 2 x 7 = 28 2 x 3 x 7 = 42 2 x 2 x 3 x 7 = 84, the LCM