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SUBTRACTION Self-Correcting Quiz - FOURS

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