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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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