Question

Determine the LCM of 9 and 21

Answer 1

Answer:

63

Step-by-step explanation:

Find the prime factorization of 9

9 = 3 × 3

Find the prime factorization of 21

21 = 3 × 7

Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

LCM = 3 × 3 × 7

LCM = 63