13 and 9 1: The greatest common divisor is 13, and the smallest common multiple is 9 1.

78 and 52: The greatest common divisor is 26, and the least common multiple is 156.

12,18,24: maximum common divisor 6, minimum common multiple 72.

20,80,50: The greatest common divisor is 10, and the smallest common multiple is 400.

9. 10 and 12: The greatest common divisor is 1 and the smallest common multiple is 360.