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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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