Let's get this math done. We have 849 and we're going to multiply it by 39. This is the same as taking 849 and adding it to itself 39 times.
Step 1: 0 + 849 = 849
Step 2: 849 + 849 = 1698
Step 3: 1698 + 849 = 2547
Step 4: 2547 + 849 = 3396
Step 5: 3396 + 849 = 4245
Step 6: 4245 + 849 = 5094
Step 7: 5094 + 849 = 5943
Step 8: 5943 + 849 = 6792
Step 9: 6792 + 849 = 7641
Step 10: 7641 + 849 = 8490
Step 11: 8490 + 849 = 9339
Step 12: 9339 + 849 = 10188
Step 13: 10188 + 849 = 11037
Step 14: 11037 + 849 = 11886
Step 15: 11886 + 849 = 12735
Step 16: 12735 + 849 = 13584
Step 17: 13584 + 849 = 14433
Step 18: 14433 + 849 = 15282
Step 19: 15282 + 849 = 16131
Step 20: 16131 + 849 = 16980
Step 21: 16980 + 849 = 17829
Step 22: 17829 + 849 = 18678
Step 23: 18678 + 849 = 19527
Step 24: 19527 + 849 = 20376
Step 25: 20376 + 849 = 21225
Step 26: 21225 + 849 = 22074
Step 27: 22074 + 849 = 22923
Step 28: 22923 + 849 = 23772
Step 29: 23772 + 849 = 24621
Step 30: 24621 + 849 = 25470
Step 31: 25470 + 849 = 26319
Step 32: 26319 + 849 = 27168
Step 33: 27168 + 849 = 28017
Step 34: 28017 + 849 = 28866
Step 35: 28866 + 849 = 29715
Step 36: 29715 + 849 = 30564
Step 37: 30564 + 849 = 31413
Step 38: 31413 + 849 = 32262
Step 39: 32262 + 849 = 33111

So, 849*39 = 33111