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SUBTRACTION Self-Correcting Quiz - SIXES

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