Let's roll up our sleeves and solve this. We have 838 and we're going to multiply it by 41, essentially adding 838 to itself 41 times.
Step 1: 0 + 838 = 838
Step 2: 838 + 838 = 1676
Step 3: 1676 + 838 = 2514
Step 4: 2514 + 838 = 3352
Step 5: 3352 + 838 = 4190
Step 6: 4190 + 838 = 5028
Step 7: 5028 + 838 = 5866
Step 8: 5866 + 838 = 6704
Step 9: 6704 + 838 = 7542
Step 10: 7542 + 838 = 8380
Step 11: 8380 + 838 = 9218
Step 12: 9218 + 838 = 10056
Step 13: 10056 + 838 = 10894
Step 14: 10894 + 838 = 11732
Step 15: 11732 + 838 = 12570
Step 16: 12570 + 838 = 13408
Step 17: 13408 + 838 = 14246
Step 18: 14246 + 838 = 15084
Step 19: 15084 + 838 = 15922
Step 20: 15922 + 838 = 16760
Step 21: 16760 + 838 = 17598
Step 22: 17598 + 838 = 18436
Step 23: 18436 + 838 = 19274
Step 24: 19274 + 838 = 20112
Step 25: 20112 + 838 = 20950
Step 26: 20950 + 838 = 21788
Step 27: 21788 + 838 = 22626
Step 28: 22626 + 838 = 23464
Step 29: 23464 + 838 = 24302
Step 30: 24302 + 838 = 25140
Step 31: 25140 + 838 = 25978
Step 32: 25978 + 838 = 26816
Step 33: 26816 + 838 = 27654
Step 34: 27654 + 838 = 28492
Step 35: 28492 + 838 = 29330
Step 36: 29330 + 838 = 30168
Step 37: 30168 + 838 = 31006
Step 38: 31006 + 838 = 31844
Step 39: 31844 + 838 = 32682
Step 40: 32682 + 838 = 33520
Step 41: 33520 + 838 = 34358

So, 838*41 = 34358