Use a factor tree.
84
42,2
21,2,2
7,3,2,2
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84 Divide by two.
42,2 Divide by two.
21,2,2 Divide by three.
7,3,2,2 Stop.
2 x 2 x 3 x 7 = 84
7
7
The LCM, or Least Common Multiple, of 7 and 84 is the smallest multiple that both numbers share. To find the LCM, you can first find the prime factorization of each number: 7 is a prime number, and 84 can be broken down into 2^2 * 3 * 7. To find the LCM, you take the highest power of each prime factor that appears in either number, which in this case would be 2^2 * 3 * 7 = 84. Therefore, the LCM of 7 and 84 is 84.
2 84 3 12 3 4 2 2
3 could be a prime factor but it depends on which number you're trying to find the prime factors of.