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SUBTRACTION Self-Correcting Quiz - SEVENS

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