ADDITION Self-Correcting Quiz - THREES

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