9 + 3 = (a)  

9 + 4 = (a)  

9 + 5 = (a)  

9 + 6 = (a)  

9 + 7 = (a)  

9 + 8 = (a)  

9 + 9 = (a)  

8 + 3 = (a)  

8 + 4 = (a)  

8 + 5 = (a)  

8 + 6 = (a)  

8 + 7 = (a)  

8 + 8 = (a)  

8 + 9 = (a)  

7 + 4 = (a)  

7 + 5 = (a)  

7 + 6 = (a)  

7 + 7 = (a)  

7 + 8 = (a)  

7 + 9 = (a)  

6 + 5 = (a)  

• 6 + 6 = (a)  

6 + 7 = (a)  

6 + 8 = (a)  

6 + 9 = (a)  

5 + 6 = (a)  

5 + 7 = (a)  

5 + 8 = (a)  

5 + 9 = (a)  

4 + 7 = (a)  

4 + 8 = (a)  

4 + 9 = (a)  

3 + 8 = (a)  

3 + 9 = (a)  

11 - 2 = (a)  

11 - 3 = (a)  

11 - 4 = (a)  

11 - 5 = (a)  

11 - 6 = (a)  

11 - 7 = (a)  

11 - 8 = (a)  

11 - 9 = (a)  

12 - 3 = (a)  

12 - 4 = (a)  

12 - 5 = (a)  

12 - 6 = (a)  

12 - 7 = (a)  

12 - 8 = (a)  

12 - 9 = (a)  

13 - 4 = (a)  

13 - 6 = (a)  

13 - 7 = (a)  

13 - 8 = (a)  

13 - 9 = (a)  

14 - 5 = (a)  

14 - 6 = (a)  

14 - 7 = (a)  

14 - 8= (a)  

14 - 9 = (a)  

15 - 6 = (a)  

15 - 7 = (a)  

15 - 8 = (a)  

15 - 9 = (a)  

16 - 7 = (a)  

16 - 8 = (a)  

16 - 9 = (a)  

17 - 8 = (a)  

17 - 9 = (a)  

18 - 9 = (a)