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. 3 B. 5
    C. 6 D. 2
    Hint

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

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

  4.   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. 8 B. 4
    C. 16 D. 2
    Hint

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