12. The greatest common factor and the least common multiple of 16 and 30 24、16、18、 14、21、42、 22、77、42、 Say pull down, use short method, step by step, how to seek

12. The greatest common factor and the least common multiple of 16 and 30 24、16、18、 14、21、42、 22、77、42、 Say pull down, use short method, step by step, how to seek

First, 24.16.18 △ 2, = 12.8.9, after omitting 8, look at 12 and 9, then 8 is dragged down, which is 3, equal to 4.8.3. Then multiply them, the greatest common factor is 6, and the least common multiple is 576