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ADDITION Self-Correcting Quiz - Up Through the FOURS

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