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13 questions
11-5=
5
4
8
6
18-0=
6
18
8
0
9-5=
3
2
5
4
16-4=
20
12
0
16
7-3=
5
3
2
4
10-5=
9
8
6
5
5-2=
1
4
2
3
14-2=
12
11
16
0
11-6=
7
9
4
5
6-3=
3
2
5
4
12-0=?
4
12
0
120
11 - 11= ?
11
111
12
0
20-8=?
11
14
28
12
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