1.   Find the missing numbers.

12, ___, 14, ___

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

  2.   Find the missing number.

8, ___, 6

    A. 14 B. 7
    C. 9 D. 2
    Hint

  3.   Find the missing numbers.

4, ___, 6, ___

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

  4.   Find the missing number.

10, ___, 12

    A. 15 B. 9
    C. 11 D. 13
    Hint

  5.   Find the missing numbers.

6, ___, 8, ___

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