OK, let's crack this. We're given 626 and our task is to multiply it by 25. Essentially, we'll be adding 626 to itself 25 times.
Step 1: 0 + 626 = 626
Step 2: 626 + 626 = 1252
Step 3: 1252 + 626 = 1878
Step 4: 1878 + 626 = 2504
Step 5: 2504 + 626 = 3130
Step 6: 3130 + 626 = 3756
Step 7: 3756 + 626 = 4382
Step 8: 4382 + 626 = 5008
Step 9: 5008 + 626 = 5634
Step 10: 5634 + 626 = 6260
Step 11: 6260 + 626 = 6886
Step 12: 6886 + 626 = 7512
Step 13: 7512 + 626 = 8138
Step 14: 8138 + 626 = 8764
Step 15: 8764 + 626 = 9390
Step 16: 9390 + 626 = 10016
Step 17: 10016 + 626 = 10642
Step 18: 10642 + 626 = 11268
Step 19: 11268 + 626 = 11894
Step 20: 11894 + 626 = 12520
Step 21: 12520 + 626 = 13146
Step 22: 13146 + 626 = 13772
Step 23: 13772 + 626 = 14398
Step 24: 14398 + 626 = 15024
Step 25: 15024 + 626 = 15650

So, 626*25 = 15650