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ADDITION Self-Correcting Quiz - TWOS

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