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