Question

Please help me not understanding

Answer 1

When it asks for the greatest common factor of two numbers it means what is the largest number that will go into both given numbers. So the greatest common factor between 8 and 12 is 4 and the greatest common factor between 9 and 45 is 9.

Answer 2

7) 4
8) 22
9) 9
10) 12

Good luck!