1.   Find the missing numbers.

12, ___, 14, ___

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

  2.   Find the missing number.

3, 2, ___

    A. 1 B. 4
    C. 2 D. 5
    Hint

  3.   Find the missing numbers.

4, ___, 6, ___

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

  4.   Find the missing number.

___, 13, 14

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

  5.   Find the missing numbers.

6, ___, 8, ___

    A. 6, 9 B. 7, 10
    C. 8, 9 D. 7, 9
    Hint