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SUBTRACTION Self-Correcting Quiz - SIXES

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