Calculate the sums in columns.

1. Example:

  2535
+  408
------
  1943

2. Example:

   725
+ 5074
------
  1317

3. Example:

  1231
+  804
------
  4356

4. Example:

  3002
+ 5631
------
   279

5. Example:

  9076
+ 7508
------
  1427

6. Example:

  1597
+ 4055
------
  7208

7. Example:

  9909
+  909
------
  9990

8. Example:

 83654
+10637
------
 9076

9. Example:

 40809
+11486
------
 53801

10. Example:

  7879
+13514
------
 90618

11. Example:

 74030
+29619
------
43573

12. Example:

 97630
+12819
------
43717

13. Example:

 60418
+153148
------
276456

14. Example:

 54303
+156907
------
427894

15. Example:

 37561
+12459
------
 7080

16. Example:

 20134
+57806
------
 4055

17. Example:

 35456
+50867
------
 3814

18. Example:

 15639
+40707
------
83197

19. Example:

 73279
+18618
------
43826

20. Example:

 356596
+127608
------
 30564

21. Example:

 156354
+ 87507
------
557801

Answer: The image contains various addition problems solved using the column method.