OK, let's work through this together. We're starting with 427 and we're going to multiply it by 91, which means we add 427 to itself 91 times.
Step 1: 0 + 427 = 427
Step 2: 427 + 427 = 854
Step 3: 854 + 427 = 1281
Step 4: 1281 + 427 = 1708
Step 5: 1708 + 427 = 2135
Step 6: 2135 + 427 = 2562
Step 7: 2562 + 427 = 2989
Step 8: 2989 + 427 = 3416
Step 9: 3416 + 427 = 3843
Step 10: 3843 + 427 = 4270
Step 11: 4270 + 427 = 4697
Step 12: 4697 + 427 = 5124
Step 13: 5124 + 427 = 5551
Step 14: 5551 + 427 = 5978
Step 15: 5978 + 427 = 6405
Step 16: 6405 + 427 = 6832
Step 17: 6832 + 427 = 7259
Step 18: 7259 + 427 = 7686
Step 19: 7686 + 427 = 8113
Step 20: 8113 + 427 = 8540
Step 21: 8540 + 427 = 8967
Step 22: 8967 + 427 = 9394
Step 23: 9394 + 427 = 9821
Step 24: 9821 + 427 = 10248
Step 25: 10248 + 427 = 10675
Step 26: 10675 + 427 = 11102
Step 27: 11102 + 427 = 11529
Step 28: 11529 + 427 = 11956
Step 29: 11956 + 427 = 12383
Step 30: 12383 + 427 = 12810
Step 31: 12810 + 427 = 13237
Step 32: 13237 + 427 = 13664
Step 33: 13664 + 427 = 14091
Step 34: 14091 + 427 = 14518
Step 35: 14518 + 427 = 14945
Step 36: 14945 + 427 = 15372
Step 37: 15372 + 427 = 15799
Step 38: 15799 + 427 = 16226
Step 39: 16226 + 427 = 16653
Step 40: 16653 + 427 = 17080
Step 41: 17080 + 427 = 17507
Step 42: 17507 + 427 = 17934
Step 43: 17934 + 427 = 18361
Step 44: 18361 + 427 = 18788
Step 45: 18788 + 427 = 19215
Step 46: 19215 + 427 = 19642
Step 47: 19642 + 427 = 20069
Step 48: 20069 + 427 = 20496
Step 49: 20496 + 427 = 20923
Step 50: 20923 + 427 = 21350
Step 51: 21350 + 427 = 21777
Step 52: 21777 + 427 = 22204
Step 53: 22204 + 427 = 22631
Step 54: 22631 + 427 = 23058
Step 55: 23058 + 427 = 23485
Step 56: 23485 + 427 = 23912
Step 57: 23912 + 427 = 24339
Step 58: 24339 + 427 = 24766
Step 59: 24766 + 427 = 25193
Step 60: 25193 + 427 = 25620
Step 61: 25620 + 427 = 26047
Step 62: 26047 + 427 = 26474
Step 63: 26474 + 427 = 26901
Step 64: 26901 + 427 = 27328
Step 65: 27328 + 427 = 27755
Step 66: 27755 + 427 = 28182
Step 67: 28182 + 427 = 28609
Step 68: 28609 + 427 = 29036
Step 69: 29036 + 427 = 29463
Step 70: 29463 + 427 = 29890
Step 71: 29890 + 427 = 30317
Step 72: 30317 + 427 = 30744
Step 73: 30744 + 427 = 31171
Step 74: 31171 + 427 = 31598
Step 75: 31598 + 427 = 32025
Step 76: 32025 + 427 = 32452
Step 77: 32452 + 427 = 32879
Step 78: 32879 + 427 = 33306
Step 79: 33306 + 427 = 33733
Step 80: 33733 + 427 = 34160
Step 81: 34160 + 427 = 34587
Step 82: 34587 + 427 = 35014
Step 83: 35014 + 427 = 35441
Step 84: 35441 + 427 = 35868
Step 85: 35868 + 427 = 36295
Step 86: 36295 + 427 = 36722
Step 87: 36722 + 427 = 37149
Step 88: 37149 + 427 = 37576
Step 89: 37576 + 427 = 38003
Step 90: 38003 + 427 = 38430
Step 91: 38430 + 427 = 38857

So, 427*91 = 38857