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ADDITION Self-Correcting Quiz - Up Through the FOURS

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