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ADDITION Self-Correcting Quiz - Up Through the THREES

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