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ADDITION Self-Correcting Quiz - THREES

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