ADDITION Self-Correcting Quiz - SIXES

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