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SUBTRACTION Self-Correcting Quiz - SEVENS

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