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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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