Question

Find the LCM of first 5 composite numbers (A) 180 (B) 360 (C) 720 (D) 1080​

Answer 1

1 . Find the prime factorization of 180

180 = 2 × 2 × 3 × 3 × 5

2. Find the prime factorization of 360

360 = 2 × 2 × 2 × 3 × 3 × 5

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

LCM = 2 × 2 × 2 × 3 × 3 × 5

4. LCM = 360