ADDITION Self-Correcting Quiz - Up Through the FOURS

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