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ADDITION Self-Correcting Quiz - Up Through the TWOS

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