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SUBTRACTION Self-Correcting Quiz - Up Through the TWOS

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