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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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