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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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