1.
2 + 0 =
2
1
|
2.
1 + 7 =
8
1
|
3.
2 – 2 =
0
2
|
4.
4 + 0 =
1
4
|
5.
9 + 1 =
1
10
|
6.
10 – 4 =
6
1
|
7.
9 – 7 =
2
1
|
8.
5 + 0 =
1
5
|
9.
10 – 9 =
2
1
|
10.
7 – 4 =
1
3
|
11.
7 + 2 =
9
1
|
12.
9 – 2 =
1
7
|
13.
5 – 2 =
1
3
|
14.
2 + 6 =
1
8
|
15.
1 + 5 =
1
6
|
16.
3 – 3 =
0
2
|
17.
5 + 4 =
1
9
|
18.
1 – 1 =
2
0
|
19.
8 – 7 =
1
2
|
20.
9 + 0 =
1
9
|
1.
2 + 0 =
2
1
|
2.
1 + 7 =
8
1
|
3.
2 – 2 =
0
2
|
4.
4 + 0 =
1
4
|
5.
9 + 1 =
1
10
|
6.
10 – 4 =
6
1
|
7.
9 – 7 =
2
1
|
8.
5 + 0 =
1
5
|
9.
10 – 9 =
2
1
|
10.
7 – 4 =
1
3
|
11.
7 + 2 =
9
1
|
12.
9 – 2 =
1
7
|
13.
5 – 2 =
1
3
|
14.
2 + 6 =
1
8
|
15.
1 + 5 =
1
6
|
16.
3 – 3 =
0
2
|
17.
5 + 4 =
1
9
|
18.
1 – 1 =
2
0
|
19.
8 – 7 =
1
2
|
20.
9 + 0 =
1
9
|