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ADDITION Self-Correcting Quiz - Up Through the FOURS

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