Alright, let's solve this math problem step by step. First, we have the number 781. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 164. So, we're going to take the number 781 and add it to itself 164 times.
Step 1: 0 + 781 = 781
Step 2: 781 + 781 = 1562
Step 3: 1562 + 781 = 2343
Step 4: 2343 + 781 = 3124
Step 5: 3124 + 781 = 3905
Step 6: 3905 + 781 = 4686
Step 7: 4686 + 781 = 5467
Step 8: 5467 + 781 = 6248
Step 9: 6248 + 781 = 7029
Step 10: 7029 + 781 = 7810
Step 11: 7810 + 781 = 8591
Step 12: 8591 + 781 = 9372
Step 13: 9372 + 781 = 10153
Step 14: 10153 + 781 = 10934
Step 15: 10934 + 781 = 11715
Step 16: 11715 + 781 = 12496
Step 17: 12496 + 781 = 13277
Step 18: 13277 + 781 = 14058
Step 19: 14058 + 781 = 14839
Step 20: 14839 + 781 = 15620
Step 21: 15620 + 781 = 16401
Step 22: 16401 + 781 = 17182
Step 23: 17182 + 781 = 17963
Step 24: 17963 + 781 = 18744
Step 25: 18744 + 781 = 19525
Step 26: 19525 + 781 = 20306
Step 27: 20306 + 781 = 21087
Step 28: 21087 + 781 = 21868
Step 29: 21868 + 781 = 22649
Step 30: 22649 + 781 = 23430
Step 31: 23430 + 781 = 24211
Step 32: 24211 + 781 = 24992
Step 33: 24992 + 781 = 25773
Step 34: 25773 + 781 = 26554
Step 35: 26554 + 781 = 27335
Step 36: 27335 + 781 = 28116
Step 37: 28116 + 781 = 28897
Step 38: 28897 + 781 = 29678
Step 39: 29678 + 781 = 30459
Step 40: 30459 + 781 = 31240
Step 41: 31240 + 781 = 32021
Step 42: 32021 + 781 = 32802
Step 43: 32802 + 781 = 33583
Step 44: 33583 + 781 = 34364
Step 45: 34364 + 781 = 35145
Step 46: 35145 + 781 = 35926
Step 47: 35926 + 781 = 36707
Step 48: 36707 + 781 = 37488
Step 49: 37488 + 781 = 38269
Step 50: 38269 + 781 = 39050
Step 51: 39050 + 781 = 39831
Step 52: 39831 + 781 = 40612
Step 53: 40612 + 781 = 41393
Step 54: 41393 + 781 = 42174
Step 55: 42174 + 781 = 42955
Step 56: 42955 + 781 = 43736
Step 57: 43736 + 781 = 44517
Step 58: 44517 + 781 = 45298
Step 59: 45298 + 781 = 46079
Step 60: 46079 + 781 = 46860
Step 61: 46860 + 781 = 47641
Step 62: 47641 + 781 = 48422
Step 63: 48422 + 781 = 49203
Step 64: 49203 + 781 = 49984
Step 65: 49984 + 781 = 50765
Step 66: 50765 + 781 = 51546
Step 67: 51546 + 781 = 52327
Step 68: 52327 + 781 = 53108
Step 69: 53108 + 781 = 53889
Step 70: 53889 + 781 = 54670
Step 71: 54670 + 781 = 55451
Step 72: 55451 + 781 = 56232
Step 73: 56232 + 781 = 57013
Step 74: 57013 + 781 = 57794
Step 75: 57794 + 781 = 58575
Step 76: 58575 + 781 = 59356
Step 77: 59356 + 781 = 60137
Step 78: 60137 + 781 = 60918
Step 79: 60918 + 781 = 61699
Step 80: 61699 + 781 = 62480
Step 81: 62480 + 781 = 63261
Step 82: 63261 + 781 = 64042
Step 83: 64042 + 781 = 64823
Step 84: 64823 + 781 = 65604
Step 85: 65604 + 781 = 66385
Step 86: 66385 + 781 = 67166
Step 87: 67166 + 781 = 67947
Step 88: 67947 + 781 = 68728
Step 89: 68728 + 781 = 69509
Step 90: 69509 + 781 = 70290
Step 91: 70290 + 781 = 71071
Step 92: 71071 + 781 = 71852
Step 93: 71852 + 781 = 72633
Step 94: 72633 + 781 = 73414
Step 95: 73414 + 781 = 74195
Step 96: 74195 + 781 = 74976
Step 97: 74976 + 781 = 75757
Step 98: 75757 + 781 = 76538
Step 99: 76538 + 781 = 77319
Step 100: 77319 + 781 = 78100
Step 101: 78100 + 781 = 78881
Step 102: 78881 + 781 = 79662
Step 103: 79662 + 781 = 80443
Step 104: 80443 + 781 = 81224
Step 105: 81224 + 781 = 82005
Step 106: 82005 + 781 = 82786
Step 107: 82786 + 781 = 83567
Step 108: 83567 + 781 = 84348
Step 109: 84348 + 781 = 85129
Step 110: 85129 + 781 = 85910
Step 111: 85910 + 781 = 86691
Step 112: 86691 + 781 = 87472
Step 113: 87472 + 781 = 88253
Step 114: 88253 + 781 = 89034
Step 115: 89034 + 781 = 89815
Step 116: 89815 + 781 = 90596
Step 117: 90596 + 781 = 91377
Step 118: 91377 + 781 = 92158
Step 119: 92158 + 781 = 92939
Step 120: 92939 + 781 = 93720
Step 121: 93720 + 781 = 94501
Step 122: 94501 + 781 = 95282
Step 123: 95282 + 781 = 96063
Step 124: 96063 + 781 = 96844
Step 125: 96844 + 781 = 97625
Step 126: 97625 + 781 = 98406
Step 127: 98406 + 781 = 99187
Step 128: 99187 + 781 = 99968
Step 129: 99968 + 781 = 100749
Step 130: 100749 + 781 = 101530
Step 131: 101530 + 781 = 102311
Step 132: 102311 + 781 = 103092
Step 133: 103092 + 781 = 103873
Step 134: 103873 + 781 = 104654
Step 135: 104654 + 781 = 105435
Step 136: 105435 + 781 = 106216
Step 137: 106216 + 781 = 106997
Step 138: 106997 + 781 = 107778
Step 139: 107778 + 781 = 108559
Step 140: 108559 + 781 = 109340
Step 141: 109340 + 781 = 110121
Step 142: 110121 + 781 = 110902
Step 143: 110902 + 781 = 111683
Step 144: 111683 + 781 = 112464
Step 145: 112464 + 781 = 113245
Step 146: 113245 + 781 = 114026
Step 147: 114026 + 781 = 114807
Step 148: 114807 + 781 = 115588
Step 149: 115588 + 781 = 116369
Step 150: 116369 + 781 = 117150
Step 151: 117150 + 781 = 117931
Step 152: 117931 + 781 = 118712
Step 153: 118712 + 781 = 119493
Step 154: 119493 + 781 = 120274
Step 155: 120274 + 781 = 121055
Step 156: 121055 + 781 = 121836
Step 157: 121836 + 781 = 122617
Step 158: 122617 + 781 = 123398
Step 159: 123398 + 781 = 124179
Step 160: 124179 + 781 = 124960
Step 161: 124960 + 781 = 125741
Step 162: 125741 + 781 = 126522
Step 163: 126522 + 781 = 127303
Step 164: 127303 + 781 = 128084

So, 781*164 = 128084