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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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