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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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