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ADDITION Self-Correcting Quiz - Up Through the FOURS

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