ADDITION Self-Correcting Quiz - Up Through the TWOS

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