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ADDITION Self-Correcting Quiz - ZEROS

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