ADDITION Self-Correcting Quiz - FOURS

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