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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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