ADDITION Self-Correcting Quiz - TWOS

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