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SUBTRACTION Self-Correcting Quiz - SEVENS

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