1 + 9 =?

(a)  

2 + 4 =?

(a)  

4 + 5 =?

(a)  

3 + 7 =?

(a)  

9 ﹣9 =?

(a)  

7 ﹣2 =?

(a)  

6 ﹣1 =?

(a)  

8 ﹣5 =?

(a)  

4 ﹣1 =？

(a)  

2 + (a)   = 7

8 + (a)   = 10

(a)   + 4 = 10

(a)   + 5 = 7

10 + (a)   = 10

3 + (a)   = 7

2 + (a)   = 10

9 ﹣ (a)   = 4

8 ﹣ (a)   = 6

10 ﹣ (a)   = 4

4 ﹣ (a)   = 1

10 ﹣ (a)   = 8

6 ﹣ (a)   = 1

7 ﹣ (a)   = 2

(a)   ﹣6 = 3

(a)   ﹣2 = 6

(a)   ﹣5 = 3

(a)   ﹣7 = 2

(a)   ﹣4 = 0

(a)   ﹣6 = 1