Answer:
1, 2, 3, 6, 9, 18.
Step-by-step explanation:
factors of 36:
1, 2, 3, 4, 6, 9, 12, 18, 36.
factors of 90:
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.
common factors of 36 and 90 means factors that belongs to both 36 and 90
common factors:
1, 2, 3, 6, 9, 18.
