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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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