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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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