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SUBTRACTION Self-Correcting Quiz - FOURS

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