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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

1
1
-  0
2
5
-  0
3
2
-  0
4
9
-  0
5
9
-  1
6
5
-  1
7
3
-  0
8
8
-  0
9
3
-  1
10
0
-  0
11
1
-  1
12
7
-  0
13
6
-  1
14
4
-  0
15
7
-  1
16
4
-  1
17
2
-  1
18
8
-  1
19
10
-  1
20
6
-  0
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