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ADDITION Self-Correcting Quiz - FOURS

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