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ADDITION Self-Correcting Quiz - TWOS

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