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ADDITION Self-Correcting Quiz - TWOS

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