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ADDITION Self-Correcting Quiz - THREES

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