ADDITION Self-Correcting Quiz - TWOS

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