Let's roll up our sleeves and solve this. We have 813 and we're going to multiply it by 56, essentially adding 813 to itself 56 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

So, 813*56 = 45528