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. 5
    C. 6 D. 3
    Hint

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

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

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

  5.   Look at the factors of 24 and 16. What is the greatest common factor?
factors of 16: 1, 2, 4, 8, 16
factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
    A. 4 B. 2
    C. 8 D. 16
    Hint