ADDITION Self-Correcting Quiz - Up Through the FOURS

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