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.
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The least common multiple of 64 and 96 is 192.
The Least Common Multiple (LCM) of (15,33,44) is 660.
least common multiple of 30 and 75 is 150.
The Least Common Multiple of 14, 20, and 22 is 1,540.
the common denominator!