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SUBTRACTION Self-Correcting Quiz - FOURS

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