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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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