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SUBTRACTION Self-Correcting Quiz - Up Through the ONES

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