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13 questions
23 - 23 =
1
46
0
10
19 - 8 =
11
1
12
27
29 - 4 =
7
5
25
33
34 - 22 =
2
10
12
6
21 - 0 =
22
2
0
21
36 -11 =
5
25
35
15
28 - 20 =
8
18
28
0
25 - 13 =
2
13
12
3
30 - 10 =
20
0
10
40
27 - 7 =
20
17
10
7
18 - 12 =
26
16
6
0
29 - 27 =
2
12
7
22
34 - 13 =
1
11
21
13
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