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SUBTRACTION Self-Correcting Quiz - FOURS

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