ADDITION Self-Correcting Quiz - Up Through the TWOS

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