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ADDITION Self-Correcting Quiz - Up Through the THREES

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