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ADDITION Self-Correcting Quiz - Up Through the TWOS

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