1.   Find the missing numbers.

12, ___, 14, ___

    A. 15, 13 B. 13, 16
    C. 12, 12 D. 13, 15
    Hint

  2.   Find the missing number.

5, ___, 7

    A. 8 B. 6
    C. 4 D. 5
    Hint

  3.   Find the missing numbers.

4, ___, 6, ___

    A. 5, 7 B. 5, 6
    C. 7, 5 D. 10, 9
    Hint

  4.   Find the missing number.

9, ___, 7

    A. 6 B. 10
    C. 8 D. 18
    Hint

  5.   Find the missing number.

___, 13, 14

    A. 11 B. 15
    C. 10 D. 12
    Hint