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SUBTRACTION Self-Correcting Quiz - SIXES

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