1.   Find the missing numbers.

9 + 5 = ___

___ − 9 = 5
    A. 13 B. 14
    C. 16 D. 15
    Hint
  2.   Find the missing numbers.

7 + 3 = ___

___ − 7 = 3
    A. 12 B. 9
    C. 10 D. 11
    Hint
  3.   Find the missing numbers.

6 + 5 = ___

___ − 6 = 5
    A. 10 B. 9
    C. 12 D. 11
    Hint
  4.   Find the missing numbers.

2 + 4 = ___

___ − 2 = 4
    A. 8 B. 5
    C. 6 D. 7
    Hint
  5.   Find the missing numbers.

9 + 8 = ___

___ − 9 = 8
    A. 17 B. 18
    C. 16 D. 15
    Hint