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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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