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ADDITION Self-Correcting Quiz - THREES

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