3,026 + 2,689

(a)  

6,774 + 7,826

(a)  

1,762 + 3,722

(a)  

9,778 + 1,226

(a)  

4,400 + 4,474

(a)  

7,942 + 9,798

(a)  

7,559 + 8,529

(a)  

7,274 + 4,558

(a)  

5,536 + 5,619

(a)