What are the common and least common multiples of 8&12, 3&5, 7&11, 9&10, 24&36, 20&25, 42&14, 30&12?

Answer 1

Multiples of 8

Multiples of 8: 8*1=8, 8*2=16, and etc:
8: 8, 16, 24, 32, 40, 48, 56, 64, 72,80, 88, 96.
12: 12, 24, 36, 48, 60, 72, 84, 96.
Common Multiples: 24, 48, 72, 96.
LCM = 24.

3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36.
5: 5, 10, 15, 20, 25, 30, 35, 40.
Common Multiples: 15, 30.
LCM = 15.

You can finish the problem.