List all the common multiples of 4 and 10 that are smaller than 50. Give the answer(s) in ascending order. (Eg 1, 2, 3)
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48
Multiples of 10: 10, 20, 30, 40
Common multiples: 20, 40
Answer(s): 20, 40