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SUBTRACTION Self-Correcting Quiz - FOURS

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