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ADDITION Self-Correcting Quiz - TWOS

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