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SUBTRACTION Self-Correcting Quiz - SEVENS

1
10
-  7
2
8
-  7
3
9
-  7
4
8
-  7
5
15
-  7
6
13
-  7
7
11
-  7
8
14
-  7
9
12
-  7
10
15
-  7
11
13
-  7
12
12
-  7
13
16
-  7
14
16
-  7
15
10
-  7
16
11
-  7
17
14
-  7
18
9
-  7
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