1.   Count on to add. You can use the number line.

4 + 9 = ___

   
    A. 12 B. 15
    C. 11 D. 13
    Hint

  2.   Count on to add. You can use the number line.

3 + 2 = ___

   
    A. 6 B. 5
    C. 7 D. 4
    Hint

  3.   Count on to add. You can use the number line.

___ = 4 + 5

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

  4.   Count on to add. You can use the number line.

___ = 9 + 2

   
    A. 12 B. 7
    C. 11 D. 10
    Hint

  5.   Count on to add. You can use the number line.

___ = 6 + 5

   
    A. 12 B. 11
    C. 10 D. 13
    Hint