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ADDITION Self-Correcting Quiz - TWOS

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