OK, let's crack this. We're given 258 and our task is to multiply it by 187. Essentially, we'll be adding 258 to itself 187 times.
Step 1: 0 + 258 = 258
Step 2: 258 + 258 = 516
Step 3: 516 + 258 = 774
Step 4: 774 + 258 = 1032
Step 5: 1032 + 258 = 1290
Step 6: 1290 + 258 = 1548
Step 7: 1548 + 258 = 1806
Step 8: 1806 + 258 = 2064
Step 9: 2064 + 258 = 2322
Step 10: 2322 + 258 = 2580
Step 11: 2580 + 258 = 2838
Step 12: 2838 + 258 = 3096
Step 13: 3096 + 258 = 3354
Step 14: 3354 + 258 = 3612
Step 15: 3612 + 258 = 3870
Step 16: 3870 + 258 = 4128
Step 17: 4128 + 258 = 4386
Step 18: 4386 + 258 = 4644
Step 19: 4644 + 258 = 4902
Step 20: 4902 + 258 = 5160
Step 21: 5160 + 258 = 5418
Step 22: 5418 + 258 = 5676
Step 23: 5676 + 258 = 5934
Step 24: 5934 + 258 = 6192
Step 25: 6192 + 258 = 6450
Step 26: 6450 + 258 = 6708
Step 27: 6708 + 258 = 6966
Step 28: 6966 + 258 = 7224
Step 29: 7224 + 258 = 7482
Step 30: 7482 + 258 = 7740
Step 31: 7740 + 258 = 7998
Step 32: 7998 + 258 = 8256
Step 33: 8256 + 258 = 8514
Step 34: 8514 + 258 = 8772
Step 35: 8772 + 258 = 9030
Step 36: 9030 + 258 = 9288
Step 37: 9288 + 258 = 9546
Step 38: 9546 + 258 = 9804
Step 39: 9804 + 258 = 10062
Step 40: 10062 + 258 = 10320
Step 41: 10320 + 258 = 10578
Step 42: 10578 + 258 = 10836
Step 43: 10836 + 258 = 11094
Step 44: 11094 + 258 = 11352
Step 45: 11352 + 258 = 11610
Step 46: 11610 + 258 = 11868
Step 47: 11868 + 258 = 12126
Step 48: 12126 + 258 = 12384
Step 49: 12384 + 258 = 12642
Step 50: 12642 + 258 = 12900
Step 51: 12900 + 258 = 13158
Step 52: 13158 + 258 = 13416
Step 53: 13416 + 258 = 13674
Step 54: 13674 + 258 = 13932
Step 55: 13932 + 258 = 14190
Step 56: 14190 + 258 = 14448
Step 57: 14448 + 258 = 14706
Step 58: 14706 + 258 = 14964
Step 59: 14964 + 258 = 15222
Step 60: 15222 + 258 = 15480
Step 61: 15480 + 258 = 15738
Step 62: 15738 + 258 = 15996
Step 63: 15996 + 258 = 16254
Step 64: 16254 + 258 = 16512
Step 65: 16512 + 258 = 16770
Step 66: 16770 + 258 = 17028
Step 67: 17028 + 258 = 17286
Step 68: 17286 + 258 = 17544
Step 69: 17544 + 258 = 17802
Step 70: 17802 + 258 = 18060
Step 71: 18060 + 258 = 18318
Step 72: 18318 + 258 = 18576
Step 73: 18576 + 258 = 18834
Step 74: 18834 + 258 = 19092
Step 75: 19092 + 258 = 19350
Step 76: 19350 + 258 = 19608
Step 77: 19608 + 258 = 19866
Step 78: 19866 + 258 = 20124
Step 79: 20124 + 258 = 20382
Step 80: 20382 + 258 = 20640
Step 81: 20640 + 258 = 20898
Step 82: 20898 + 258 = 21156
Step 83: 21156 + 258 = 21414
Step 84: 21414 + 258 = 21672
Step 85: 21672 + 258 = 21930
Step 86: 21930 + 258 = 22188
Step 87: 22188 + 258 = 22446
Step 88: 22446 + 258 = 22704
Step 89: 22704 + 258 = 22962
Step 90: 22962 + 258 = 23220
Step 91: 23220 + 258 = 23478
Step 92: 23478 + 258 = 23736
Step 93: 23736 + 258 = 23994
Step 94: 23994 + 258 = 24252
Step 95: 24252 + 258 = 24510
Step 96: 24510 + 258 = 24768
Step 97: 24768 + 258 = 25026
Step 98: 25026 + 258 = 25284
Step 99: 25284 + 258 = 25542
Step 100: 25542 + 258 = 25800
Step 101: 25800 + 258 = 26058
Step 102: 26058 + 258 = 26316
Step 103: 26316 + 258 = 26574
Step 104: 26574 + 258 = 26832
Step 105: 26832 + 258 = 27090
Step 106: 27090 + 258 = 27348
Step 107: 27348 + 258 = 27606
Step 108: 27606 + 258 = 27864
Step 109: 27864 + 258 = 28122
Step 110: 28122 + 258 = 28380
Step 111: 28380 + 258 = 28638
Step 112: 28638 + 258 = 28896
Step 113: 28896 + 258 = 29154
Step 114: 29154 + 258 = 29412
Step 115: 29412 + 258 = 29670
Step 116: 29670 + 258 = 29928
Step 117: 29928 + 258 = 30186
Step 118: 30186 + 258 = 30444
Step 119: 30444 + 258 = 30702
Step 120: 30702 + 258 = 30960
Step 121: 30960 + 258 = 31218
Step 122: 31218 + 258 = 31476
Step 123: 31476 + 258 = 31734
Step 124: 31734 + 258 = 31992
Step 125: 31992 + 258 = 32250
Step 126: 32250 + 258 = 32508
Step 127: 32508 + 258 = 32766
Step 128: 32766 + 258 = 33024
Step 129: 33024 + 258 = 33282
Step 130: 33282 + 258 = 33540
Step 131: 33540 + 258 = 33798
Step 132: 33798 + 258 = 34056
Step 133: 34056 + 258 = 34314
Step 134: 34314 + 258 = 34572
Step 135: 34572 + 258 = 34830
Step 136: 34830 + 258 = 35088
Step 137: 35088 + 258 = 35346
Step 138: 35346 + 258 = 35604
Step 139: 35604 + 258 = 35862
Step 140: 35862 + 258 = 36120
Step 141: 36120 + 258 = 36378
Step 142: 36378 + 258 = 36636
Step 143: 36636 + 258 = 36894
Step 144: 36894 + 258 = 37152
Step 145: 37152 + 258 = 37410
Step 146: 37410 + 258 = 37668
Step 147: 37668 + 258 = 37926
Step 148: 37926 + 258 = 38184
Step 149: 38184 + 258 = 38442
Step 150: 38442 + 258 = 38700
Step 151: 38700 + 258 = 38958
Step 152: 38958 + 258 = 39216
Step 153: 39216 + 258 = 39474
Step 154: 39474 + 258 = 39732
Step 155: 39732 + 258 = 39990
Step 156: 39990 + 258 = 40248
Step 157: 40248 + 258 = 40506
Step 158: 40506 + 258 = 40764
Step 159: 40764 + 258 = 41022
Step 160: 41022 + 258 = 41280
Step 161: 41280 + 258 = 41538
Step 162: 41538 + 258 = 41796
Step 163: 41796 + 258 = 42054
Step 164: 42054 + 258 = 42312
Step 165: 42312 + 258 = 42570
Step 166: 42570 + 258 = 42828
Step 167: 42828 + 258 = 43086
Step 168: 43086 + 258 = 43344
Step 169: 43344 + 258 = 43602
Step 170: 43602 + 258 = 43860
Step 171: 43860 + 258 = 44118
Step 172: 44118 + 258 = 44376
Step 173: 44376 + 258 = 44634
Step 174: 44634 + 258 = 44892
Step 175: 44892 + 258 = 45150
Step 176: 45150 + 258 = 45408
Step 177: 45408 + 258 = 45666
Step 178: 45666 + 258 = 45924
Step 179: 45924 + 258 = 46182
Step 180: 46182 + 258 = 46440
Step 181: 46440 + 258 = 46698
Step 182: 46698 + 258 = 46956
Step 183: 46956 + 258 = 47214
Step 184: 47214 + 258 = 47472
Step 185: 47472 + 258 = 47730
Step 186: 47730 + 258 = 47988
Step 187: 47988 + 258 = 48246

So, 258*187 = 48246