Answer:
4. D. 12
5. A. 4
Step-by-step explanation:
The factors of 12: 1, 2, 3, 4, 6, 12
The factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
The common factors of 12 and 36 are 1, 2, 3, 4, 6, 12
The greatest common factor is 12
The factors of 12: 1, 2, 3, 4, 6, 12
The factors of 20: 1, 2, 4, 5, 10, 20
The common factors of 12 and 20 are 1, 2, 4
The greatest common factor is 4
