Let's get this math done. We have 854 and we're going to multiply it by 81. This is the same as taking 854 and adding it to itself 81 times.
Step 1: 0 + 854 = 854
Step 2: 854 + 854 = 1708
Step 3: 1708 + 854 = 2562
Step 4: 2562 + 854 = 3416
Step 5: 3416 + 854 = 4270
Step 6: 4270 + 854 = 5124
Step 7: 5124 + 854 = 5978
Step 8: 5978 + 854 = 6832
Step 9: 6832 + 854 = 7686
Step 10: 7686 + 854 = 8540
Step 11: 8540 + 854 = 9394
Step 12: 9394 + 854 = 10248
Step 13: 10248 + 854 = 11102
Step 14: 11102 + 854 = 11956
Step 15: 11956 + 854 = 12810
Step 16: 12810 + 854 = 13664
Step 17: 13664 + 854 = 14518
Step 18: 14518 + 854 = 15372
Step 19: 15372 + 854 = 16226
Step 20: 16226 + 854 = 17080
Step 21: 17080 + 854 = 17934
Step 22: 17934 + 854 = 18788
Step 23: 18788 + 854 = 19642
Step 24: 19642 + 854 = 20496
Step 25: 20496 + 854 = 21350
Step 26: 21350 + 854 = 22204
Step 27: 22204 + 854 = 23058
Step 28: 23058 + 854 = 23912
Step 29: 23912 + 854 = 24766
Step 30: 24766 + 854 = 25620
Step 31: 25620 + 854 = 26474
Step 32: 26474 + 854 = 27328
Step 33: 27328 + 854 = 28182
Step 34: 28182 + 854 = 29036
Step 35: 29036 + 854 = 29890
Step 36: 29890 + 854 = 30744
Step 37: 30744 + 854 = 31598
Step 38: 31598 + 854 = 32452
Step 39: 32452 + 854 = 33306
Step 40: 33306 + 854 = 34160
Step 41: 34160 + 854 = 35014
Step 42: 35014 + 854 = 35868
Step 43: 35868 + 854 = 36722
Step 44: 36722 + 854 = 37576
Step 45: 37576 + 854 = 38430
Step 46: 38430 + 854 = 39284
Step 47: 39284 + 854 = 40138
Step 48: 40138 + 854 = 40992
Step 49: 40992 + 854 = 41846
Step 50: 41846 + 854 = 42700
Step 51: 42700 + 854 = 43554
Step 52: 43554 + 854 = 44408
Step 53: 44408 + 854 = 45262
Step 54: 45262 + 854 = 46116
Step 55: 46116 + 854 = 46970
Step 56: 46970 + 854 = 47824
Step 57: 47824 + 854 = 48678
Step 58: 48678 + 854 = 49532
Step 59: 49532 + 854 = 50386
Step 60: 50386 + 854 = 51240
Step 61: 51240 + 854 = 52094
Step 62: 52094 + 854 = 52948
Step 63: 52948 + 854 = 53802
Step 64: 53802 + 854 = 54656
Step 65: 54656 + 854 = 55510
Step 66: 55510 + 854 = 56364
Step 67: 56364 + 854 = 57218
Step 68: 57218 + 854 = 58072
Step 69: 58072 + 854 = 58926
Step 70: 58926 + 854 = 59780
Step 71: 59780 + 854 = 60634
Step 72: 60634 + 854 = 61488
Step 73: 61488 + 854 = 62342
Step 74: 62342 + 854 = 63196
Step 75: 63196 + 854 = 64050
Step 76: 64050 + 854 = 64904
Step 77: 64904 + 854 = 65758
Step 78: 65758 + 854 = 66612
Step 79: 66612 + 854 = 67466
Step 80: 67466 + 854 = 68320
Step 81: 68320 + 854 = 69174

So, 854*81 = 69174