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ADDITION Self-Correcting Quiz - Up Through the TWOS

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