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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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