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10 questions
15 - 9 =
4
5
6
7
18 - 9 =
10
9
8
7
11 - 8 =
3
4
5
6
16 - 7 =
7
8
9
10
16 - 8 =
5
6
7
8
12 - 7 =
5
6
7
8
13 - 9 =
6
5
4
3
17 - 9 =
7
8
9
10
16 - 9 =
5
6
7
8
17 - 8 =
9
10
11
12
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