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