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ADDITION Self-Correcting Quiz - Up Through the FOURS

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