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ADDITION Self-Correcting Quiz - ZEROS

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