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ADDITION Self-Correcting Quiz - THREES

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