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ADDITION Self-Correcting Quiz - Up Through the TWOS

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