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ADDITION Self-Correcting Quiz - THREES

1
7
+  3
2
6
+  3
3
3
+  9
4
3
+  4
5
3
+  7
6
3
+  1
7
1
+  3
8
5
+  3
9
2
+  3
10
3
+  3
11
3
+  8
12
3
+  5
13
3
+  3
14
3
+  0
15
0
+  3
16
8
+  3
17
9
+  3
18
3
+  6
19
3
+  2
20
4
+  3
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