42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, 546, . . .
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Their least common multiple is 42.
The Least Common Multiple (LCM) for 42 70 84 is 420.The Greatest Common Factor (GCF) for 42 70 84 is 14.
First you need to find the prime factors of 28 and 42. 28= 7x22 42= 7x3x2 Then you multiply 7x3x22, the product of which is 84, which is your answer.
The least common multiple is the smallest positive number that is a multiple of two or more numbers. 14: 14, 28, 42, 56, 70, 84, 98 49: 98 The least common multiple for 14 and 49 and is 98.
42 + 42 = 84