1.   Find the missing numbers. 5, 10, _, 20, _, _
    A. 15, 30, 40 B. 5, 10, 20
    C. 15, 25, 35 D. 15, 25, 30
    Hint

  2.   Find the missing numbers. 2, 4, 6, _, _, 12, _
    A. 8, 10, 12 B. 8, 10, 14
    C. 6, 7, 12 D. 7, 9, 14
    Hint

  3.   Find the pattern.

7, 14, 21, 28;

    A. Skip counting by 6s B. Skip counting by 8s
    C. Skip counting by 7s D. Skip counting by 5s
    Hint

  4.   Find the pattern.

50, 55, 60, 65

    A. Skip counting by 6s B. Skip counting by 10s
    C. Skip counting by 5s D. Skip counting by 15s
    Hint

  5.   Find the sum.

9 + 9 + 9 = _

    A. 36 B. 39
    C. 18 D. 27
    Hint