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It can be and is. Since 16 is not a factor of 42, the GCF will have to be a factor of 16 that is less than 16.
16 = 24 42 = 2 x 3 x 7 lcm = 24 x 3 x 7 = 336
The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 4 and 42 is 84.
The prime factors of 16 are 2 x 2 x 2 x 2 or 24.
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