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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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