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SUBTRACTION Self-Correcting Quiz - SIXES

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