Without delay, let's solve this. We've got 634 and we will be multiplying it by 13, that is, adding 634 to itself 13 times.
Step 1: 0 + 634 = 634
Step 2: 634 + 634 = 1268
Step 3: 1268 + 634 = 1902
Step 4: 1902 + 634 = 2536
Step 5: 2536 + 634 = 3170
Step 6: 3170 + 634 = 3804
Step 7: 3804 + 634 = 4438
Step 8: 4438 + 634 = 5072
Step 9: 5072 + 634 = 5706
Step 10: 5706 + 634 = 6340
Step 11: 6340 + 634 = 6974
Step 12: 6974 + 634 = 7608
Step 13: 7608 + 634 = 8242

So, 634*13 = 8242