1.   Look at the factors of 18 and 30. What is the greatest common factor?
factors of 18: 1, 2, 3, 6, 9, 18
factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
    A. 5 B. 6
    C. 2 D. 3
    Hint

  2.   Find the GCF of 24 and 54.
    A. 12 B. 6
    C. 2 D. 3
    Hint

  3.   Find the GCF of 16, 12, and 36.
    A. 3 B. 4
    C. 6 D. 2
    Hint

  4.   Which two numbers have a GCF of 9?
    A. 36, 39 B. 45, 95
    C. 18, 36 D. 36, 45
    Hint

  5.   Which two numbers have a GCF of 7?
    A. 21, 63 B. 7, 17
    C. 25, 45 D. 35, 126
    Hint