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SUBTRACTION Self-Correcting Quiz - FOURS

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