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10 questions
8 + ? = 14
3
4
5
6
4 + ? = 11
6
7
8
9
? + 5 = 12
5
6
7
8
? + 8 = 13
5
4
6
7
9 - ? = 3
6
5
7
4
10 - ? = 4
5
6
7
4
12 - ? = 6
4
5
7
6
? - 5 = 8
14
13
12
11
14 - ? = 9
6
4
7
5
15 - ? = 8
7
5
6
8
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