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ADDITION Self-Correcting Quiz - Up Through the TWOS

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