1.   Find the missing number in the equation.

12 + 5 = 12 + __

    A. 17 B. 6
    C. 12 D. 5
    Hint

  2.   Find the missing number in the equation.

14 + __ = 8 + 14

    A. 14 B. 8
    C. 22 D. 6
    Hint

  3.   Find the missing number in the equation.

22 + 8 = 10 + 12 + __

    A. 8 B. 10
    C. 22 D. 12
    Hint

  4.   Find the missing number in the equation.

15 + 2 = 7 + 8 + __

    A. 2 B. 8
    C. 6 D. 7
    Hint

  5.   Find the missing number in the equation.

8 + 5 + 7 = 8 + 7 + __

    A. 5 B. 15
    C. 7 D. 6
    Hint