Let's roll up our sleeves and solve this. We have 933 and we're going to multiply it by 81, essentially adding 933 to itself 81 times.
Step 1: 0 + 933 = 933
Step 2: 933 + 933 = 1866
Step 3: 1866 + 933 = 2799
Step 4: 2799 + 933 = 3732
Step 5: 3732 + 933 = 4665
Step 6: 4665 + 933 = 5598
Step 7: 5598 + 933 = 6531
Step 8: 6531 + 933 = 7464
Step 9: 7464 + 933 = 8397
Step 10: 8397 + 933 = 9330
Step 11: 9330 + 933 = 10263
Step 12: 10263 + 933 = 11196
Step 13: 11196 + 933 = 12129
Step 14: 12129 + 933 = 13062
Step 15: 13062 + 933 = 13995
Step 16: 13995 + 933 = 14928
Step 17: 14928 + 933 = 15861
Step 18: 15861 + 933 = 16794
Step 19: 16794 + 933 = 17727
Step 20: 17727 + 933 = 18660
Step 21: 18660 + 933 = 19593
Step 22: 19593 + 933 = 20526
Step 23: 20526 + 933 = 21459
Step 24: 21459 + 933 = 22392
Step 25: 22392 + 933 = 23325
Step 26: 23325 + 933 = 24258
Step 27: 24258 + 933 = 25191
Step 28: 25191 + 933 = 26124
Step 29: 26124 + 933 = 27057
Step 30: 27057 + 933 = 27990
Step 31: 27990 + 933 = 28923
Step 32: 28923 + 933 = 29856
Step 33: 29856 + 933 = 30789
Step 34: 30789 + 933 = 31722
Step 35: 31722 + 933 = 32655
Step 36: 32655 + 933 = 33588
Step 37: 33588 + 933 = 34521
Step 38: 34521 + 933 = 35454
Step 39: 35454 + 933 = 36387
Step 40: 36387 + 933 = 37320
Step 41: 37320 + 933 = 38253
Step 42: 38253 + 933 = 39186
Step 43: 39186 + 933 = 40119
Step 44: 40119 + 933 = 41052
Step 45: 41052 + 933 = 41985
Step 46: 41985 + 933 = 42918
Step 47: 42918 + 933 = 43851
Step 48: 43851 + 933 = 44784
Step 49: 44784 + 933 = 45717
Step 50: 45717 + 933 = 46650
Step 51: 46650 + 933 = 47583
Step 52: 47583 + 933 = 48516
Step 53: 48516 + 933 = 49449
Step 54: 49449 + 933 = 50382
Step 55: 50382 + 933 = 51315
Step 56: 51315 + 933 = 52248
Step 57: 52248 + 933 = 53181
Step 58: 53181 + 933 = 54114
Step 59: 54114 + 933 = 55047
Step 60: 55047 + 933 = 55980
Step 61: 55980 + 933 = 56913
Step 62: 56913 + 933 = 57846
Step 63: 57846 + 933 = 58779
Step 64: 58779 + 933 = 59712
Step 65: 59712 + 933 = 60645
Step 66: 60645 + 933 = 61578
Step 67: 61578 + 933 = 62511
Step 68: 62511 + 933 = 63444
Step 69: 63444 + 933 = 64377
Step 70: 64377 + 933 = 65310
Step 71: 65310 + 933 = 66243
Step 72: 66243 + 933 = 67176
Step 73: 67176 + 933 = 68109
Step 74: 68109 + 933 = 69042
Step 75: 69042 + 933 = 69975
Step 76: 69975 + 933 = 70908
Step 77: 70908 + 933 = 71841
Step 78: 71841 + 933 = 72774
Step 79: 72774 + 933 = 73707
Step 80: 73707 + 933 = 74640
Step 81: 74640 + 933 = 75573

So, 933*81 = 75573