Let's get this math done. We have 757 and we're going to multiply it by 121. This is the same as taking 757 and adding it to itself 121 times.
Step 1: 0 + 757 = 757
Step 2: 757 + 757 = 1514
Step 3: 1514 + 757 = 2271
Step 4: 2271 + 757 = 3028
Step 5: 3028 + 757 = 3785
Step 6: 3785 + 757 = 4542
Step 7: 4542 + 757 = 5299
Step 8: 5299 + 757 = 6056
Step 9: 6056 + 757 = 6813
Step 10: 6813 + 757 = 7570
Step 11: 7570 + 757 = 8327
Step 12: 8327 + 757 = 9084
Step 13: 9084 + 757 = 9841
Step 14: 9841 + 757 = 10598
Step 15: 10598 + 757 = 11355
Step 16: 11355 + 757 = 12112
Step 17: 12112 + 757 = 12869
Step 18: 12869 + 757 = 13626
Step 19: 13626 + 757 = 14383
Step 20: 14383 + 757 = 15140
Step 21: 15140 + 757 = 15897
Step 22: 15897 + 757 = 16654
Step 23: 16654 + 757 = 17411
Step 24: 17411 + 757 = 18168
Step 25: 18168 + 757 = 18925
Step 26: 18925 + 757 = 19682
Step 27: 19682 + 757 = 20439
Step 28: 20439 + 757 = 21196
Step 29: 21196 + 757 = 21953
Step 30: 21953 + 757 = 22710
Step 31: 22710 + 757 = 23467
Step 32: 23467 + 757 = 24224
Step 33: 24224 + 757 = 24981
Step 34: 24981 + 757 = 25738
Step 35: 25738 + 757 = 26495
Step 36: 26495 + 757 = 27252
Step 37: 27252 + 757 = 28009
Step 38: 28009 + 757 = 28766
Step 39: 28766 + 757 = 29523
Step 40: 29523 + 757 = 30280
Step 41: 30280 + 757 = 31037
Step 42: 31037 + 757 = 31794
Step 43: 31794 + 757 = 32551
Step 44: 32551 + 757 = 33308
Step 45: 33308 + 757 = 34065
Step 46: 34065 + 757 = 34822
Step 47: 34822 + 757 = 35579
Step 48: 35579 + 757 = 36336
Step 49: 36336 + 757 = 37093
Step 50: 37093 + 757 = 37850
Step 51: 37850 + 757 = 38607
Step 52: 38607 + 757 = 39364
Step 53: 39364 + 757 = 40121
Step 54: 40121 + 757 = 40878
Step 55: 40878 + 757 = 41635
Step 56: 41635 + 757 = 42392
Step 57: 42392 + 757 = 43149
Step 58: 43149 + 757 = 43906
Step 59: 43906 + 757 = 44663
Step 60: 44663 + 757 = 45420
Step 61: 45420 + 757 = 46177
Step 62: 46177 + 757 = 46934
Step 63: 46934 + 757 = 47691
Step 64: 47691 + 757 = 48448
Step 65: 48448 + 757 = 49205
Step 66: 49205 + 757 = 49962
Step 67: 49962 + 757 = 50719
Step 68: 50719 + 757 = 51476
Step 69: 51476 + 757 = 52233
Step 70: 52233 + 757 = 52990
Step 71: 52990 + 757 = 53747
Step 72: 53747 + 757 = 54504
Step 73: 54504 + 757 = 55261
Step 74: 55261 + 757 = 56018
Step 75: 56018 + 757 = 56775
Step 76: 56775 + 757 = 57532
Step 77: 57532 + 757 = 58289
Step 78: 58289 + 757 = 59046
Step 79: 59046 + 757 = 59803
Step 80: 59803 + 757 = 60560
Step 81: 60560 + 757 = 61317
Step 82: 61317 + 757 = 62074
Step 83: 62074 + 757 = 62831
Step 84: 62831 + 757 = 63588
Step 85: 63588 + 757 = 64345
Step 86: 64345 + 757 = 65102
Step 87: 65102 + 757 = 65859
Step 88: 65859 + 757 = 66616
Step 89: 66616 + 757 = 67373
Step 90: 67373 + 757 = 68130
Step 91: 68130 + 757 = 68887
Step 92: 68887 + 757 = 69644
Step 93: 69644 + 757 = 70401
Step 94: 70401 + 757 = 71158
Step 95: 71158 + 757 = 71915
Step 96: 71915 + 757 = 72672
Step 97: 72672 + 757 = 73429
Step 98: 73429 + 757 = 74186
Step 99: 74186 + 757 = 74943
Step 100: 74943 + 757 = 75700
Step 101: 75700 + 757 = 76457
Step 102: 76457 + 757 = 77214
Step 103: 77214 + 757 = 77971
Step 104: 77971 + 757 = 78728
Step 105: 78728 + 757 = 79485
Step 106: 79485 + 757 = 80242
Step 107: 80242 + 757 = 80999
Step 108: 80999 + 757 = 81756
Step 109: 81756 + 757 = 82513
Step 110: 82513 + 757 = 83270
Step 111: 83270 + 757 = 84027
Step 112: 84027 + 757 = 84784
Step 113: 84784 + 757 = 85541
Step 114: 85541 + 757 = 86298
Step 115: 86298 + 757 = 87055
Step 116: 87055 + 757 = 87812
Step 117: 87812 + 757 = 88569
Step 118: 88569 + 757 = 89326
Step 119: 89326 + 757 = 90083
Step 120: 90083 + 757 = 90840
Step 121: 90840 + 757 = 91597

So, 757*121 = 91597