Sure thing! We've got 808 and we're gonna multiply it by 91. That's the same as adding 808 to itself 91 times.
Step 1: 0 + 808 = 808
Step 2: 808 + 808 = 1616
Step 3: 1616 + 808 = 2424
Step 4: 2424 + 808 = 3232
Step 5: 3232 + 808 = 4040
Step 6: 4040 + 808 = 4848
Step 7: 4848 + 808 = 5656
Step 8: 5656 + 808 = 6464
Step 9: 6464 + 808 = 7272
Step 10: 7272 + 808 = 8080
Step 11: 8080 + 808 = 8888
Step 12: 8888 + 808 = 9696
Step 13: 9696 + 808 = 10504
Step 14: 10504 + 808 = 11312
Step 15: 11312 + 808 = 12120
Step 16: 12120 + 808 = 12928
Step 17: 12928 + 808 = 13736
Step 18: 13736 + 808 = 14544
Step 19: 14544 + 808 = 15352
Step 20: 15352 + 808 = 16160
Step 21: 16160 + 808 = 16968
Step 22: 16968 + 808 = 17776
Step 23: 17776 + 808 = 18584
Step 24: 18584 + 808 = 19392
Step 25: 19392 + 808 = 20200
Step 26: 20200 + 808 = 21008
Step 27: 21008 + 808 = 21816
Step 28: 21816 + 808 = 22624
Step 29: 22624 + 808 = 23432
Step 30: 23432 + 808 = 24240
Step 31: 24240 + 808 = 25048
Step 32: 25048 + 808 = 25856
Step 33: 25856 + 808 = 26664
Step 34: 26664 + 808 = 27472
Step 35: 27472 + 808 = 28280
Step 36: 28280 + 808 = 29088
Step 37: 29088 + 808 = 29896
Step 38: 29896 + 808 = 30704
Step 39: 30704 + 808 = 31512
Step 40: 31512 + 808 = 32320
Step 41: 32320 + 808 = 33128
Step 42: 33128 + 808 = 33936
Step 43: 33936 + 808 = 34744
Step 44: 34744 + 808 = 35552
Step 45: 35552 + 808 = 36360
Step 46: 36360 + 808 = 37168
Step 47: 37168 + 808 = 37976
Step 48: 37976 + 808 = 38784
Step 49: 38784 + 808 = 39592
Step 50: 39592 + 808 = 40400
Step 51: 40400 + 808 = 41208
Step 52: 41208 + 808 = 42016
Step 53: 42016 + 808 = 42824
Step 54: 42824 + 808 = 43632
Step 55: 43632 + 808 = 44440
Step 56: 44440 + 808 = 45248
Step 57: 45248 + 808 = 46056
Step 58: 46056 + 808 = 46864
Step 59: 46864 + 808 = 47672
Step 60: 47672 + 808 = 48480
Step 61: 48480 + 808 = 49288
Step 62: 49288 + 808 = 50096
Step 63: 50096 + 808 = 50904
Step 64: 50904 + 808 = 51712
Step 65: 51712 + 808 = 52520
Step 66: 52520 + 808 = 53328
Step 67: 53328 + 808 = 54136
Step 68: 54136 + 808 = 54944
Step 69: 54944 + 808 = 55752
Step 70: 55752 + 808 = 56560
Step 71: 56560 + 808 = 57368
Step 72: 57368 + 808 = 58176
Step 73: 58176 + 808 = 58984
Step 74: 58984 + 808 = 59792
Step 75: 59792 + 808 = 60600
Step 76: 60600 + 808 = 61408
Step 77: 61408 + 808 = 62216
Step 78: 62216 + 808 = 63024
Step 79: 63024 + 808 = 63832
Step 80: 63832 + 808 = 64640
Step 81: 64640 + 808 = 65448
Step 82: 65448 + 808 = 66256
Step 83: 66256 + 808 = 67064
Step 84: 67064 + 808 = 67872
Step 85: 67872 + 808 = 68680
Step 86: 68680 + 808 = 69488
Step 87: 69488 + 808 = 70296
Step 88: 70296 + 808 = 71104
Step 89: 71104 + 808 = 71912
Step 90: 71912 + 808 = 72720
Step 91: 72720 + 808 = 73528

So, 808*91 = 73528