What is the least common multiple of 16 and 18

What is the least common multiple of 16 and 18

16=2*2*2*2
18=2*3*3
The least common multiple of 16 and 18 is 2 * 2 * 2 * 2 * 3 * 3 = 144

What is the greatest common divisor of 18 and 30______ The least common multiple is______ ．

30 = 2 × 3 × 518 = 2 × 3 × 3, so the greatest common divisor of 30 and 18 is 2 × 3 = 6, and the least common multiple is 2 × 3 × 5 × 3 = 90

Find the greatest common divisor and the least common multiple of 20 250 by decomposing the prime factor,

20=2×2×5；
250=2×5×5×5；
Therefore, the greatest common divisor of 20 and 250 is 2 × 5 = 10;
The least common multiple is 2 × 2 × 5 × 5 = 500

What is the least common multiple of 18 and 42______ ．

18 = 2 × 3 × 3, 42 = 2 × 3 × 7, so the least common multiple of 18 and 42 is 2 × 3 × 3 × 7 = 126