ADDITION Self-Correcting Quiz - TWOS

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