ADDITION Self-Correcting Quiz - FOURS

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