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ADDITION Self-Correcting Quiz - THREES

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