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SUBTRACTION Self-Correcting Quiz - SIXES

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