Answer:
270
Explanation:
Find the prime factorization of 54
54 = 2 × 3 × 3 × 3
Find the prime factorization of 90
90 = 2 × 3 × 3 × 5
Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:
LCM = 2 × 3 × 3 × 3 × 5
LCM = 270