3 X 7 = (a)  

5 x 10 = (a)  

6 X 3 = (a)  

7 X (a)   = 70

5 X 6 = (a)  

2 X (a)   = 8

8 X 3 = (a)  

(a)   X 10 = 80

6 x 6 = (a)  

7 X 4 = (a)  

4 X 8 = (a)  

6 X 7 = (a)  

45 = (a)   X 5

40 = 8 X (a)  

3 X 3 = (a)  

9 X (a)   = 90

8 X 4 = (a)  

6 X 4 = (a)  

7 X (a)   = 14