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SUBTRACTION Self-Correcting Quiz - SIXES

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