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SUBTRACTION Self-Correcting Quiz - SEVENS

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