12. The least common multiple of 15 and 18 Write it down by short division

12. The least common multiple of 15 and 18 Write it down by short division

12/3=4,4/2=2
15/3=5
18/3=6,6/2=3
So the least common multiple of 12, 15 and 18 is 3 * 2 * 2 * 5 * 3 = 180

What is the least common multiple of 12 and 15______ Let's decompose this number. The prime factor is______ ．

(1) 12 = 2 × 2 × 3, 15 = 3 × 5, so the least common multiple of 12 and 15 is: 3 × 2 × 2 × 5 = 60; (2) 60 = 2 × 2 × 3 × 5; so the answer is: 60, 60 = 2 × 2 × 3 × 5

The least common multiple of 15 and 18
Decompose it into prime factors

The least common multiple of 15 and 18 = 3 * 5 * 6 = 90
90 decomposition quality factor = 2 * 45 = 2 * 3 * 15 = 2 * 3 * 3 * 5

30 and 12 15 and 18 25 and 75 53 and 13 What are their least common multiple and least common factor

The least common multiple of 30 and 12 is 60, and the greatest common factor is 6
The least common multiple of 15 and 18 is 90 and the greatest common factor is 3
The least common multiple of 25 and 75 is 75, and the greatest common factor is 25
The least common multiple of 53 and 13 is 689 and the greatest common factor is 1