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ADDITION Self-Correcting Quiz - Up Through the FOURS

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