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ADDITION Self-Correcting Quiz - Up Through the FOURS

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