ADDITION Self-Correcting Quiz - Up Through the FOURS

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