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ADDITION Self-Correcting Quiz - Up Through the FOURS

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