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. 6 B. 5
    C. 3 D. 2
    Hint

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

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

  4.   Find the GCF of 32 and 42.
    A. 14 B. 2
    C. 3 D. 4
    Hint

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