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. 2 B. 6
    C. 5 D. 3
    Hint

  2.   Find the GCF of 28 and 34.
    A. 1 B. 7
    C. 4 D. 2
    Hint

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

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

  5.   Find the GCF of 38 and 49.
    A. 4 B. 3
    C. 2 D. 1
    Hint