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ADDITION Self-Correcting Quiz - Up Through the FOURS

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