Alright, let's solve this math problem step by step. First, we have the number 307. 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 307 and add it to itself 157 times.
Step 1: 0 + 307 = 307
Step 2: 307 + 307 = 614
Step 3: 614 + 307 = 921
Step 4: 921 + 307 = 1228
Step 5: 1228 + 307 = 1535
Step 6: 1535 + 307 = 1842
Step 7: 1842 + 307 = 2149
Step 8: 2149 + 307 = 2456
Step 9: 2456 + 307 = 2763
Step 10: 2763 + 307 = 3070
Step 11: 3070 + 307 = 3377
Step 12: 3377 + 307 = 3684
Step 13: 3684 + 307 = 3991
Step 14: 3991 + 307 = 4298
Step 15: 4298 + 307 = 4605
Step 16: 4605 + 307 = 4912
Step 17: 4912 + 307 = 5219
Step 18: 5219 + 307 = 5526
Step 19: 5526 + 307 = 5833
Step 20: 5833 + 307 = 6140
Step 21: 6140 + 307 = 6447
Step 22: 6447 + 307 = 6754
Step 23: 6754 + 307 = 7061
Step 24: 7061 + 307 = 7368
Step 25: 7368 + 307 = 7675
Step 26: 7675 + 307 = 7982
Step 27: 7982 + 307 = 8289
Step 28: 8289 + 307 = 8596
Step 29: 8596 + 307 = 8903
Step 30: 8903 + 307 = 9210
Step 31: 9210 + 307 = 9517
Step 32: 9517 + 307 = 9824
Step 33: 9824 + 307 = 10131
Step 34: 10131 + 307 = 10438
Step 35: 10438 + 307 = 10745
Step 36: 10745 + 307 = 11052
Step 37: 11052 + 307 = 11359
Step 38: 11359 + 307 = 11666
Step 39: 11666 + 307 = 11973
Step 40: 11973 + 307 = 12280
Step 41: 12280 + 307 = 12587
Step 42: 12587 + 307 = 12894
Step 43: 12894 + 307 = 13201
Step 44: 13201 + 307 = 13508
Step 45: 13508 + 307 = 13815
Step 46: 13815 + 307 = 14122
Step 47: 14122 + 307 = 14429
Step 48: 14429 + 307 = 14736
Step 49: 14736 + 307 = 15043
Step 50: 15043 + 307 = 15350
Step 51: 15350 + 307 = 15657
Step 52: 15657 + 307 = 15964
Step 53: 15964 + 307 = 16271
Step 54: 16271 + 307 = 16578
Step 55: 16578 + 307 = 16885
Step 56: 16885 + 307 = 17192
Step 57: 17192 + 307 = 17499
Step 58: 17499 + 307 = 17806
Step 59: 17806 + 307 = 18113
Step 60: 18113 + 307 = 18420
Step 61: 18420 + 307 = 18727
Step 62: 18727 + 307 = 19034
Step 63: 19034 + 307 = 19341
Step 64: 19341 + 307 = 19648
Step 65: 19648 + 307 = 19955
Step 66: 19955 + 307 = 20262
Step 67: 20262 + 307 = 20569
Step 68: 20569 + 307 = 20876
Step 69: 20876 + 307 = 21183
Step 70: 21183 + 307 = 21490
Step 71: 21490 + 307 = 21797
Step 72: 21797 + 307 = 22104
Step 73: 22104 + 307 = 22411
Step 74: 22411 + 307 = 22718
Step 75: 22718 + 307 = 23025
Step 76: 23025 + 307 = 23332
Step 77: 23332 + 307 = 23639
Step 78: 23639 + 307 = 23946
Step 79: 23946 + 307 = 24253
Step 80: 24253 + 307 = 24560
Step 81: 24560 + 307 = 24867
Step 82: 24867 + 307 = 25174
Step 83: 25174 + 307 = 25481
Step 84: 25481 + 307 = 25788
Step 85: 25788 + 307 = 26095
Step 86: 26095 + 307 = 26402
Step 87: 26402 + 307 = 26709
Step 88: 26709 + 307 = 27016
Step 89: 27016 + 307 = 27323
Step 90: 27323 + 307 = 27630
Step 91: 27630 + 307 = 27937
Step 92: 27937 + 307 = 28244
Step 93: 28244 + 307 = 28551
Step 94: 28551 + 307 = 28858
Step 95: 28858 + 307 = 29165
Step 96: 29165 + 307 = 29472
Step 97: 29472 + 307 = 29779
Step 98: 29779 + 307 = 30086
Step 99: 30086 + 307 = 30393
Step 100: 30393 + 307 = 30700
Step 101: 30700 + 307 = 31007
Step 102: 31007 + 307 = 31314
Step 103: 31314 + 307 = 31621
Step 104: 31621 + 307 = 31928
Step 105: 31928 + 307 = 32235
Step 106: 32235 + 307 = 32542
Step 107: 32542 + 307 = 32849
Step 108: 32849 + 307 = 33156
Step 109: 33156 + 307 = 33463
Step 110: 33463 + 307 = 33770
Step 111: 33770 + 307 = 34077
Step 112: 34077 + 307 = 34384
Step 113: 34384 + 307 = 34691
Step 114: 34691 + 307 = 34998
Step 115: 34998 + 307 = 35305
Step 116: 35305 + 307 = 35612
Step 117: 35612 + 307 = 35919
Step 118: 35919 + 307 = 36226
Step 119: 36226 + 307 = 36533
Step 120: 36533 + 307 = 36840
Step 121: 36840 + 307 = 37147
Step 122: 37147 + 307 = 37454
Step 123: 37454 + 307 = 37761
Step 124: 37761 + 307 = 38068
Step 125: 38068 + 307 = 38375
Step 126: 38375 + 307 = 38682
Step 127: 38682 + 307 = 38989
Step 128: 38989 + 307 = 39296
Step 129: 39296 + 307 = 39603
Step 130: 39603 + 307 = 39910
Step 131: 39910 + 307 = 40217
Step 132: 40217 + 307 = 40524
Step 133: 40524 + 307 = 40831
Step 134: 40831 + 307 = 41138
Step 135: 41138 + 307 = 41445
Step 136: 41445 + 307 = 41752
Step 137: 41752 + 307 = 42059
Step 138: 42059 + 307 = 42366
Step 139: 42366 + 307 = 42673
Step 140: 42673 + 307 = 42980
Step 141: 42980 + 307 = 43287
Step 142: 43287 + 307 = 43594
Step 143: 43594 + 307 = 43901
Step 144: 43901 + 307 = 44208
Step 145: 44208 + 307 = 44515
Step 146: 44515 + 307 = 44822
Step 147: 44822 + 307 = 45129
Step 148: 45129 + 307 = 45436
Step 149: 45436 + 307 = 45743
Step 150: 45743 + 307 = 46050
Step 151: 46050 + 307 = 46357
Step 152: 46357 + 307 = 46664
Step 153: 46664 + 307 = 46971
Step 154: 46971 + 307 = 47278
Step 155: 47278 + 307 = 47585
Step 156: 47585 + 307 = 47892
Step 157: 47892 + 307 = 48199

So, 307*157 = 48199