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ADDITION Self-Correcting Quiz - Up Through the TWOS

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