Alright, let's solve this math problem step by step. First, we have the number 921. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 157. So, we're going to take the number 921 and add it to itself 157 times.
Step 1: 0 + 921 = 921
Step 2: 921 + 921 = 1842
Step 3: 1842 + 921 = 2763
Step 4: 2763 + 921 = 3684
Step 5: 3684 + 921 = 4605
Step 6: 4605 + 921 = 5526
Step 7: 5526 + 921 = 6447
Step 8: 6447 + 921 = 7368
Step 9: 7368 + 921 = 8289
Step 10: 8289 + 921 = 9210
Step 11: 9210 + 921 = 10131
Step 12: 10131 + 921 = 11052
Step 13: 11052 + 921 = 11973
Step 14: 11973 + 921 = 12894
Step 15: 12894 + 921 = 13815
Step 16: 13815 + 921 = 14736
Step 17: 14736 + 921 = 15657
Step 18: 15657 + 921 = 16578
Step 19: 16578 + 921 = 17499
Step 20: 17499 + 921 = 18420
Step 21: 18420 + 921 = 19341
Step 22: 19341 + 921 = 20262
Step 23: 20262 + 921 = 21183
Step 24: 21183 + 921 = 22104
Step 25: 22104 + 921 = 23025
Step 26: 23025 + 921 = 23946
Step 27: 23946 + 921 = 24867
Step 28: 24867 + 921 = 25788
Step 29: 25788 + 921 = 26709
Step 30: 26709 + 921 = 27630
Step 31: 27630 + 921 = 28551
Step 32: 28551 + 921 = 29472
Step 33: 29472 + 921 = 30393
Step 34: 30393 + 921 = 31314
Step 35: 31314 + 921 = 32235
Step 36: 32235 + 921 = 33156
Step 37: 33156 + 921 = 34077
Step 38: 34077 + 921 = 34998
Step 39: 34998 + 921 = 35919
Step 40: 35919 + 921 = 36840
Step 41: 36840 + 921 = 37761
Step 42: 37761 + 921 = 38682
Step 43: 38682 + 921 = 39603
Step 44: 39603 + 921 = 40524
Step 45: 40524 + 921 = 41445
Step 46: 41445 + 921 = 42366
Step 47: 42366 + 921 = 43287
Step 48: 43287 + 921 = 44208
Step 49: 44208 + 921 = 45129
Step 50: 45129 + 921 = 46050
Step 51: 46050 + 921 = 46971
Step 52: 46971 + 921 = 47892
Step 53: 47892 + 921 = 48813
Step 54: 48813 + 921 = 49734
Step 55: 49734 + 921 = 50655
Step 56: 50655 + 921 = 51576
Step 57: 51576 + 921 = 52497
Step 58: 52497 + 921 = 53418
Step 59: 53418 + 921 = 54339
Step 60: 54339 + 921 = 55260
Step 61: 55260 + 921 = 56181
Step 62: 56181 + 921 = 57102
Step 63: 57102 + 921 = 58023
Step 64: 58023 + 921 = 58944
Step 65: 58944 + 921 = 59865
Step 66: 59865 + 921 = 60786
Step 67: 60786 + 921 = 61707
Step 68: 61707 + 921 = 62628
Step 69: 62628 + 921 = 63549
Step 70: 63549 + 921 = 64470
Step 71: 64470 + 921 = 65391
Step 72: 65391 + 921 = 66312
Step 73: 66312 + 921 = 67233
Step 74: 67233 + 921 = 68154
Step 75: 68154 + 921 = 69075
Step 76: 69075 + 921 = 69996
Step 77: 69996 + 921 = 70917
Step 78: 70917 + 921 = 71838
Step 79: 71838 + 921 = 72759
Step 80: 72759 + 921 = 73680
Step 81: 73680 + 921 = 74601
Step 82: 74601 + 921 = 75522
Step 83: 75522 + 921 = 76443
Step 84: 76443 + 921 = 77364
Step 85: 77364 + 921 = 78285
Step 86: 78285 + 921 = 79206
Step 87: 79206 + 921 = 80127
Step 88: 80127 + 921 = 81048
Step 89: 81048 + 921 = 81969
Step 90: 81969 + 921 = 82890
Step 91: 82890 + 921 = 83811
Step 92: 83811 + 921 = 84732
Step 93: 84732 + 921 = 85653
Step 94: 85653 + 921 = 86574
Step 95: 86574 + 921 = 87495
Step 96: 87495 + 921 = 88416
Step 97: 88416 + 921 = 89337
Step 98: 89337 + 921 = 90258
Step 99: 90258 + 921 = 91179
Step 100: 91179 + 921 = 92100
Step 101: 92100 + 921 = 93021
Step 102: 93021 + 921 = 93942
Step 103: 93942 + 921 = 94863
Step 104: 94863 + 921 = 95784
Step 105: 95784 + 921 = 96705
Step 106: 96705 + 921 = 97626
Step 107: 97626 + 921 = 98547
Step 108: 98547 + 921 = 99468
Step 109: 99468 + 921 = 100389
Step 110: 100389 + 921 = 101310
Step 111: 101310 + 921 = 102231
Step 112: 102231 + 921 = 103152
Step 113: 103152 + 921 = 104073
Step 114: 104073 + 921 = 104994
Step 115: 104994 + 921 = 105915
Step 116: 105915 + 921 = 106836
Step 117: 106836 + 921 = 107757
Step 118: 107757 + 921 = 108678
Step 119: 108678 + 921 = 109599
Step 120: 109599 + 921 = 110520
Step 121: 110520 + 921 = 111441
Step 122: 111441 + 921 = 112362
Step 123: 112362 + 921 = 113283
Step 124: 113283 + 921 = 114204
Step 125: 114204 + 921 = 115125
Step 126: 115125 + 921 = 116046
Step 127: 116046 + 921 = 116967
Step 128: 116967 + 921 = 117888
Step 129: 117888 + 921 = 118809
Step 130: 118809 + 921 = 119730
Step 131: 119730 + 921 = 120651
Step 132: 120651 + 921 = 121572
Step 133: 121572 + 921 = 122493
Step 134: 122493 + 921 = 123414
Step 135: 123414 + 921 = 124335
Step 136: 124335 + 921 = 125256
Step 137: 125256 + 921 = 126177
Step 138: 126177 + 921 = 127098
Step 139: 127098 + 921 = 128019
Step 140: 128019 + 921 = 128940
Step 141: 128940 + 921 = 129861
Step 142: 129861 + 921 = 130782
Step 143: 130782 + 921 = 131703
Step 144: 131703 + 921 = 132624
Step 145: 132624 + 921 = 133545
Step 146: 133545 + 921 = 134466
Step 147: 134466 + 921 = 135387
Step 148: 135387 + 921 = 136308
Step 149: 136308 + 921 = 137229
Step 150: 137229 + 921 = 138150
Step 151: 138150 + 921 = 139071
Step 152: 139071 + 921 = 139992
Step 153: 139992 + 921 = 140913
Step 154: 140913 + 921 = 141834
Step 155: 141834 + 921 = 142755
Step 156: 142755 + 921 = 143676
Step 157: 143676 + 921 = 144597

So, 921*157 = 144597