What are the greatest common factors of 20 and 16______ The least common multiple is______ ．

What are the greatest common factors of 20 and 16______ The least common multiple is______ ．

Decompose 20 and 16 into prime factors: 20 = 2 × 2 × 5, 16 = 2 × 2 × 2, the greatest common factor of 16 and 20 is: 2 × 2 = 4; the least common multiple is: 2 × 2 × 2 × 5 = 80; answer: the greatest common factor of 16 and 20 is 4, the least common multiple is 80

What is the least common multiple of 32 and 30? What is the least common multiple of 8, 16 and 20? What is the least common multiple of 12, 16 and 20?,
Find the least common multiple as it is
Example: 60 = 2x2x3x5
42=2X3X7
The least common multiple of 60 and 42 is:
2X2X3X5X7=420.
Practice: 12 = 2x () x ()
15=（）X （）
The least common multiple of 12 and 15 is:
（ ）.

The least common multiple of 32 = 2 * 2 * 2 * 2 * 230 = 2 * 3 * 532 and 30 is 2 * 2 * 2 * 2 * 2 * 3 * 5 = 4808 = 2 * 2 * 216 = 2 * 2 * 2 * 220 = 2 * 2 * 58, the least common multiple of 16 and 20 is 2 * 2 * 2 * 2 * 5 = 8012 = 2 * 2 * 316 = 2 * 2 * 2 * 220 = 2 * 2 * 512, the least common multiple of 16 and 20 is 2 * 2 * 2 * 2 * 3 * 5 = 240

What is the least common multiple of 12 and 28

84.
The solution is as follows
12=2x2x3
28=2x2x7
Least common multiple = 2x2x3x7 = 84