ADDITION Self-Correcting Quiz - Up Through the FOURS

1
6
+  2
2
3
+  3
3
4
+  4
4
5
+  3
5
2
+  8
6
3
+  2
7
6
+  3
8
3
+  4
9
3
+  6
10
4
+  6
11
0
+  3
12
3
+  7
13
5
+  2
14
2
+  2
15
9
+  3
16
4
+  7
17
9
+  2
18
5
+  4
19
9
+  4
20
4
+  4
21
4
+  9
22
6
+  4
23
3
+  1
24
8
+  3
25
8
+  4
26
4
+  8
27
7
+  2
28
2
+  5
29
4
+  2
30
2
+  6