Alright, let's solve this math problem step by step. First, we have the number 813. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 67. So, we're going to take the number 813 and add it to itself 67 times.
Step 1: 0 + 813 = 813
Step 2: 813 + 813 = 1626
Step 3: 1626 + 813 = 2439
Step 4: 2439 + 813 = 3252
Step 5: 3252 + 813 = 4065
Step 6: 4065 + 813 = 4878
Step 7: 4878 + 813 = 5691
Step 8: 5691 + 813 = 6504
Step 9: 6504 + 813 = 7317
Step 10: 7317 + 813 = 8130
Step 11: 8130 + 813 = 8943
Step 12: 8943 + 813 = 9756
Step 13: 9756 + 813 = 10569
Step 14: 10569 + 813 = 11382
Step 15: 11382 + 813 = 12195
Step 16: 12195 + 813 = 13008
Step 17: 13008 + 813 = 13821
Step 18: 13821 + 813 = 14634
Step 19: 14634 + 813 = 15447
Step 20: 15447 + 813 = 16260
Step 21: 16260 + 813 = 17073
Step 22: 17073 + 813 = 17886
Step 23: 17886 + 813 = 18699
Step 24: 18699 + 813 = 19512
Step 25: 19512 + 813 = 20325
Step 26: 20325 + 813 = 21138
Step 27: 21138 + 813 = 21951
Step 28: 21951 + 813 = 22764
Step 29: 22764 + 813 = 23577
Step 30: 23577 + 813 = 24390
Step 31: 24390 + 813 = 25203
Step 32: 25203 + 813 = 26016
Step 33: 26016 + 813 = 26829
Step 34: 26829 + 813 = 27642
Step 35: 27642 + 813 = 28455
Step 36: 28455 + 813 = 29268
Step 37: 29268 + 813 = 30081
Step 38: 30081 + 813 = 30894
Step 39: 30894 + 813 = 31707
Step 40: 31707 + 813 = 32520
Step 41: 32520 + 813 = 33333
Step 42: 33333 + 813 = 34146
Step 43: 34146 + 813 = 34959
Step 44: 34959 + 813 = 35772
Step 45: 35772 + 813 = 36585
Step 46: 36585 + 813 = 37398
Step 47: 37398 + 813 = 38211
Step 48: 38211 + 813 = 39024
Step 49: 39024 + 813 = 39837
Step 50: 39837 + 813 = 40650
Step 51: 40650 + 813 = 41463
Step 52: 41463 + 813 = 42276
Step 53: 42276 + 813 = 43089
Step 54: 43089 + 813 = 43902
Step 55: 43902 + 813 = 44715
Step 56: 44715 + 813 = 45528
Step 57: 45528 + 813 = 46341
Step 58: 46341 + 813 = 47154
Step 59: 47154 + 813 = 47967
Step 60: 47967 + 813 = 48780
Step 61: 48780 + 813 = 49593
Step 62: 49593 + 813 = 50406
Step 63: 50406 + 813 = 51219
Step 64: 51219 + 813 = 52032
Step 65: 52032 + 813 = 52845
Step 66: 52845 + 813 = 53658
Step 67: 53658 + 813 = 54471

So, 813*67 = 54471