OK, let's work through this together. We're starting with 342 and we're going to multiply it by 487, which means we add 342 to itself 487 times.
Step 1: 0 + 342 = 342
Step 2: 342 + 342 = 684
Step 3: 684 + 342 = 1026
Step 4: 1026 + 342 = 1368
Step 5: 1368 + 342 = 1710
Step 6: 1710 + 342 = 2052
Step 7: 2052 + 342 = 2394
Step 8: 2394 + 342 = 2736
Step 9: 2736 + 342 = 3078
Step 10: 3078 + 342 = 3420
Step 11: 3420 + 342 = 3762
Step 12: 3762 + 342 = 4104
Step 13: 4104 + 342 = 4446
Step 14: 4446 + 342 = 4788
Step 15: 4788 + 342 = 5130
Step 16: 5130 + 342 = 5472
Step 17: 5472 + 342 = 5814
Step 18: 5814 + 342 = 6156
Step 19: 6156 + 342 = 6498
Step 20: 6498 + 342 = 6840
Step 21: 6840 + 342 = 7182
Step 22: 7182 + 342 = 7524
Step 23: 7524 + 342 = 7866
Step 24: 7866 + 342 = 8208
Step 25: 8208 + 342 = 8550
Step 26: 8550 + 342 = 8892
Step 27: 8892 + 342 = 9234
Step 28: 9234 + 342 = 9576
Step 29: 9576 + 342 = 9918
Step 30: 9918 + 342 = 10260
Step 31: 10260 + 342 = 10602
Step 32: 10602 + 342 = 10944
Step 33: 10944 + 342 = 11286
Step 34: 11286 + 342 = 11628
Step 35: 11628 + 342 = 11970
Step 36: 11970 + 342 = 12312
Step 37: 12312 + 342 = 12654
Step 38: 12654 + 342 = 12996
Step 39: 12996 + 342 = 13338
Step 40: 13338 + 342 = 13680
Step 41: 13680 + 342 = 14022
Step 42: 14022 + 342 = 14364
Step 43: 14364 + 342 = 14706
Step 44: 14706 + 342 = 15048
Step 45: 15048 + 342 = 15390
Step 46: 15390 + 342 = 15732
Step 47: 15732 + 342 = 16074
Step 48: 16074 + 342 = 16416
Step 49: 16416 + 342 = 16758
Step 50: 16758 + 342 = 17100
Step 51: 17100 + 342 = 17442
Step 52: 17442 + 342 = 17784
Step 53: 17784 + 342 = 18126
Step 54: 18126 + 342 = 18468
Step 55: 18468 + 342 = 18810
Step 56: 18810 + 342 = 19152
Step 57: 19152 + 342 = 19494
Step 58: 19494 + 342 = 19836
Step 59: 19836 + 342 = 20178
Step 60: 20178 + 342 = 20520
Step 61: 20520 + 342 = 20862
Step 62: 20862 + 342 = 21204
Step 63: 21204 + 342 = 21546
Step 64: 21546 + 342 = 21888
Step 65: 21888 + 342 = 22230
Step 66: 22230 + 342 = 22572
Step 67: 22572 + 342 = 22914
Step 68: 22914 + 342 = 23256
Step 69: 23256 + 342 = 23598
Step 70: 23598 + 342 = 23940
Step 71: 23940 + 342 = 24282
Step 72: 24282 + 342 = 24624
Step 73: 24624 + 342 = 24966
Step 74: 24966 + 342 = 25308
Step 75: 25308 + 342 = 25650
Step 76: 25650 + 342 = 25992
Step 77: 25992 + 342 = 26334
Step 78: 26334 + 342 = 26676
Step 79: 26676 + 342 = 27018
Step 80: 27018 + 342 = 27360
Step 81: 27360 + 342 = 27702
Step 82: 27702 + 342 = 28044
Step 83: 28044 + 342 = 28386
Step 84: 28386 + 342 = 28728
Step 85: 28728 + 342 = 29070
Step 86: 29070 + 342 = 29412
Step 87: 29412 + 342 = 29754
Step 88: 29754 + 342 = 30096
Step 89: 30096 + 342 = 30438
Step 90: 30438 + 342 = 30780
Step 91: 30780 + 342 = 31122
Step 92: 31122 + 342 = 31464
Step 93: 31464 + 342 = 31806
Step 94: 31806 + 342 = 32148
Step 95: 32148 + 342 = 32490
Step 96: 32490 + 342 = 32832
Step 97: 32832 + 342 = 33174
Step 98: 33174 + 342 = 33516
Step 99: 33516 + 342 = 33858
Step 100: 33858 + 342 = 34200
Step 101: 34200 + 342 = 34542
Step 102: 34542 + 342 = 34884
Step 103: 34884 + 342 = 35226
Step 104: 35226 + 342 = 35568
Step 105: 35568 + 342 = 35910
Step 106: 35910 + 342 = 36252
Step 107: 36252 + 342 = 36594
Step 108: 36594 + 342 = 36936
Step 109: 36936 + 342 = 37278
Step 110: 37278 + 342 = 37620
Step 111: 37620 + 342 = 37962
Step 112: 37962 + 342 = 38304
Step 113: 38304 + 342 = 38646
Step 114: 38646 + 342 = 38988
Step 115: 38988 + 342 = 39330
Step 116: 39330 + 342 = 39672
Step 117: 39672 + 342 = 40014
Step 118: 40014 + 342 = 40356
Step 119: 40356 + 342 = 40698
Step 120: 40698 + 342 = 41040
Step 121: 41040 + 342 = 41382
Step 122: 41382 + 342 = 41724
Step 123: 41724 + 342 = 42066
Step 124: 42066 + 342 = 42408
Step 125: 42408 + 342 = 42750
Step 126: 42750 + 342 = 43092
Step 127: 43092 + 342 = 43434
Step 128: 43434 + 342 = 43776
Step 129: 43776 + 342 = 44118
Step 130: 44118 + 342 = 44460
Step 131: 44460 + 342 = 44802
Step 132: 44802 + 342 = 45144
Step 133: 45144 + 342 = 45486
Step 134: 45486 + 342 = 45828
Step 135: 45828 + 342 = 46170
Step 136: 46170 + 342 = 46512
Step 137: 46512 + 342 = 46854
Step 138: 46854 + 342 = 47196
Step 139: 47196 + 342 = 47538
Step 140: 47538 + 342 = 47880
Step 141: 47880 + 342 = 48222
Step 142: 48222 + 342 = 48564
Step 143: 48564 + 342 = 48906
Step 144: 48906 + 342 = 49248
Step 145: 49248 + 342 = 49590
Step 146: 49590 + 342 = 49932
Step 147: 49932 + 342 = 50274
Step 148: 50274 + 342 = 50616
Step 149: 50616 + 342 = 50958
Step 150: 50958 + 342 = 51300
Step 151: 51300 + 342 = 51642
Step 152: 51642 + 342 = 51984
Step 153: 51984 + 342 = 52326
Step 154: 52326 + 342 = 52668
Step 155: 52668 + 342 = 53010
Step 156: 53010 + 342 = 53352
Step 157: 53352 + 342 = 53694
Step 158: 53694 + 342 = 54036
Step 159: 54036 + 342 = 54378
Step 160: 54378 + 342 = 54720
Step 161: 54720 + 342 = 55062
Step 162: 55062 + 342 = 55404
Step 163: 55404 + 342 = 55746
Step 164: 55746 + 342 = 56088
Step 165: 56088 + 342 = 56430
Step 166: 56430 + 342 = 56772
Step 167: 56772 + 342 = 57114
Step 168: 57114 + 342 = 57456
Step 169: 57456 + 342 = 57798
Step 170: 57798 + 342 = 58140
Step 171: 58140 + 342 = 58482
Step 172: 58482 + 342 = 58824
Step 173: 58824 + 342 = 59166
Step 174: 59166 + 342 = 59508
Step 175: 59508 + 342 = 59850
Step 176: 59850 + 342 = 60192
Step 177: 60192 + 342 = 60534
Step 178: 60534 + 342 = 60876
Step 179: 60876 + 342 = 61218
Step 180: 61218 + 342 = 61560
Step 181: 61560 + 342 = 61902
Step 182: 61902 + 342 = 62244
Step 183: 62244 + 342 = 62586
Step 184: 62586 + 342 = 62928
Step 185: 62928 + 342 = 63270
Step 186: 63270 + 342 = 63612
Step 187: 63612 + 342 = 63954
Step 188: 63954 + 342 = 64296
Step 189: 64296 + 342 = 64638
Step 190: 64638 + 342 = 64980
Step 191: 64980 + 342 = 65322
Step 192: 65322 + 342 = 65664
Step 193: 65664 + 342 = 66006
Step 194: 66006 + 342 = 66348
Step 195: 66348 + 342 = 66690
Step 196: 66690 + 342 = 67032
Step 197: 67032 + 342 = 67374
Step 198: 67374 + 342 = 67716
Step 199: 67716 + 342 = 68058
Step 200: 68058 + 342 = 68400
Step 201: 68400 + 342 = 68742
Step 202: 68742 + 342 = 69084
Step 203: 69084 + 342 = 69426
Step 204: 69426 + 342 = 69768
Step 205: 69768 + 342 = 70110
Step 206: 70110 + 342 = 70452
Step 207: 70452 + 342 = 70794
Step 208: 70794 + 342 = 71136
Step 209: 71136 + 342 = 71478
Step 210: 71478 + 342 = 71820
Step 211: 71820 + 342 = 72162
Step 212: 72162 + 342 = 72504
Step 213: 72504 + 342 = 72846
Step 214: 72846 + 342 = 73188
Step 215: 73188 + 342 = 73530
Step 216: 73530 + 342 = 73872
Step 217: 73872 + 342 = 74214
Step 218: 74214 + 342 = 74556
Step 219: 74556 + 342 = 74898
Step 220: 74898 + 342 = 75240
Step 221: 75240 + 342 = 75582
Step 222: 75582 + 342 = 75924
Step 223: 75924 + 342 = 76266
Step 224: 76266 + 342 = 76608
Step 225: 76608 + 342 = 76950
Step 226: 76950 + 342 = 77292
Step 227: 77292 + 342 = 77634
Step 228: 77634 + 342 = 77976
Step 229: 77976 + 342 = 78318
Step 230: 78318 + 342 = 78660
Step 231: 78660 + 342 = 79002
Step 232: 79002 + 342 = 79344
Step 233: 79344 + 342 = 79686
Step 234: 79686 + 342 = 80028
Step 235: 80028 + 342 = 80370
Step 236: 80370 + 342 = 80712
Step 237: 80712 + 342 = 81054
Step 238: 81054 + 342 = 81396
Step 239: 81396 + 342 = 81738
Step 240: 81738 + 342 = 82080
Step 241: 82080 + 342 = 82422
Step 242: 82422 + 342 = 82764
Step 243: 82764 + 342 = 83106
Step 244: 83106 + 342 = 83448
Step 245: 83448 + 342 = 83790
Step 246: 83790 + 342 = 84132
Step 247: 84132 + 342 = 84474
Step 248: 84474 + 342 = 84816
Step 249: 84816 + 342 = 85158
Step 250: 85158 + 342 = 85500
Step 251: 85500 + 342 = 85842
Step 252: 85842 + 342 = 86184
Step 253: 86184 + 342 = 86526
Step 254: 86526 + 342 = 86868
Step 255: 86868 + 342 = 87210
Step 256: 87210 + 342 = 87552
Step 257: 87552 + 342 = 87894
Step 258: 87894 + 342 = 88236
Step 259: 88236 + 342 = 88578
Step 260: 88578 + 342 = 88920
Step 261: 88920 + 342 = 89262
Step 262: 89262 + 342 = 89604
Step 263: 89604 + 342 = 89946
Step 264: 89946 + 342 = 90288
Step 265: 90288 + 342 = 90630
Step 266: 90630 + 342 = 90972
Step 267: 90972 + 342 = 91314
Step 268: 91314 + 342 = 91656
Step 269: 91656 + 342 = 91998
Step 270: 91998 + 342 = 92340
Step 271: 92340 + 342 = 92682
Step 272: 92682 + 342 = 93024
Step 273: 93024 + 342 = 93366
Step 274: 93366 + 342 = 93708
Step 275: 93708 + 342 = 94050
Step 276: 94050 + 342 = 94392
Step 277: 94392 + 342 = 94734
Step 278: 94734 + 342 = 95076
Step 279: 95076 + 342 = 95418
Step 280: 95418 + 342 = 95760
Step 281: 95760 + 342 = 96102
Step 282: 96102 + 342 = 96444
Step 283: 96444 + 342 = 96786
Step 284: 96786 + 342 = 97128
Step 285: 97128 + 342 = 97470
Step 286: 97470 + 342 = 97812
Step 287: 97812 + 342 = 98154
Step 288: 98154 + 342 = 98496
Step 289: 98496 + 342 = 98838
Step 290: 98838 + 342 = 99180
Step 291: 99180 + 342 = 99522
Step 292: 99522 + 342 = 99864
Step 293: 99864 + 342 = 100206
Step 294: 100206 + 342 = 100548
Step 295: 100548 + 342 = 100890
Step 296: 100890 + 342 = 101232
Step 297: 101232 + 342 = 101574
Step 298: 101574 + 342 = 101916
Step 299: 101916 + 342 = 102258
Step 300: 102258 + 342 = 102600
Step 301: 102600 + 342 = 102942
Step 302: 102942 + 342 = 103284
Step 303: 103284 + 342 = 103626
Step 304: 103626 + 342 = 103968
Step 305: 103968 + 342 = 104310
Step 306: 104310 + 342 = 104652
Step 307: 104652 + 342 = 104994
Step 308: 104994 + 342 = 105336
Step 309: 105336 + 342 = 105678
Step 310: 105678 + 342 = 106020
Step 311: 106020 + 342 = 106362
Step 312: 106362 + 342 = 106704
Step 313: 106704 + 342 = 107046
Step 314: 107046 + 342 = 107388
Step 315: 107388 + 342 = 107730
Step 316: 107730 + 342 = 108072
Step 317: 108072 + 342 = 108414
Step 318: 108414 + 342 = 108756
Step 319: 108756 + 342 = 109098
Step 320: 109098 + 342 = 109440
Step 321: 109440 + 342 = 109782
Step 322: 109782 + 342 = 110124
Step 323: 110124 + 342 = 110466
Step 324: 110466 + 342 = 110808
Step 325: 110808 + 342 = 111150
Step 326: 111150 + 342 = 111492
Step 327: 111492 + 342 = 111834
Step 328: 111834 + 342 = 112176
Step 329: 112176 + 342 = 112518
Step 330: 112518 + 342 = 112860
Step 331: 112860 + 342 = 113202
Step 332: 113202 + 342 = 113544
Step 333: 113544 + 342 = 113886
Step 334: 113886 + 342 = 114228
Step 335: 114228 + 342 = 114570
Step 336: 114570 + 342 = 114912
Step 337: 114912 + 342 = 115254
Step 338: 115254 + 342 = 115596
Step 339: 115596 + 342 = 115938
Step 340: 115938 + 342 = 116280
Step 341: 116280 + 342 = 116622
Step 342: 116622 + 342 = 116964
Step 343: 116964 + 342 = 117306
Step 344: 117306 + 342 = 117648
Step 345: 117648 + 342 = 117990
Step 346: 117990 + 342 = 118332
Step 347: 118332 + 342 = 118674
Step 348: 118674 + 342 = 119016
Step 349: 119016 + 342 = 119358
Step 350: 119358 + 342 = 119700
Step 351: 119700 + 342 = 120042
Step 352: 120042 + 342 = 120384
Step 353: 120384 + 342 = 120726
Step 354: 120726 + 342 = 121068
Step 355: 121068 + 342 = 121410
Step 356: 121410 + 342 = 121752
Step 357: 121752 + 342 = 122094
Step 358: 122094 + 342 = 122436
Step 359: 122436 + 342 = 122778
Step 360: 122778 + 342 = 123120
Step 361: 123120 + 342 = 123462
Step 362: 123462 + 342 = 123804
Step 363: 123804 + 342 = 124146
Step 364: 124146 + 342 = 124488
Step 365: 124488 + 342 = 124830
Step 366: 124830 + 342 = 125172
Step 367: 125172 + 342 = 125514
Step 368: 125514 + 342 = 125856
Step 369: 125856 + 342 = 126198
Step 370: 126198 + 342 = 126540
Step 371: 126540 + 342 = 126882
Step 372: 126882 + 342 = 127224
Step 373: 127224 + 342 = 127566
Step 374: 127566 + 342 = 127908
Step 375: 127908 + 342 = 128250
Step 376: 128250 + 342 = 128592
Step 377: 128592 + 342 = 128934
Step 378: 128934 + 342 = 129276
Step 379: 129276 + 342 = 129618
Step 380: 129618 + 342 = 129960
Step 381: 129960 + 342 = 130302
Step 382: 130302 + 342 = 130644
Step 383: 130644 + 342 = 130986
Step 384: 130986 + 342 = 131328
Step 385: 131328 + 342 = 131670
Step 386: 131670 + 342 = 132012
Step 387: 132012 + 342 = 132354
Step 388: 132354 + 342 = 132696
Step 389: 132696 + 342 = 133038
Step 390: 133038 + 342 = 133380
Step 391: 133380 + 342 = 133722
Step 392: 133722 + 342 = 134064
Step 393: 134064 + 342 = 134406
Step 394: 134406 + 342 = 134748
Step 395: 134748 + 342 = 135090
Step 396: 135090 + 342 = 135432
Step 397: 135432 + 342 = 135774
Step 398: 135774 + 342 = 136116
Step 399: 136116 + 342 = 136458
Step 400: 136458 + 342 = 136800
Step 401: 136800 + 342 = 137142
Step 402: 137142 + 342 = 137484
Step 403: 137484 + 342 = 137826
Step 404: 137826 + 342 = 138168
Step 405: 138168 + 342 = 138510
Step 406: 138510 + 342 = 138852
Step 407: 138852 + 342 = 139194
Step 408: 139194 + 342 = 139536
Step 409: 139536 + 342 = 139878
Step 410: 139878 + 342 = 140220
Step 411: 140220 + 342 = 140562
Step 412: 140562 + 342 = 140904
Step 413: 140904 + 342 = 141246
Step 414: 141246 + 342 = 141588
Step 415: 141588 + 342 = 141930
Step 416: 141930 + 342 = 142272
Step 417: 142272 + 342 = 142614
Step 418: 142614 + 342 = 142956
Step 419: 142956 + 342 = 143298
Step 420: 143298 + 342 = 143640
Step 421: 143640 + 342 = 143982
Step 422: 143982 + 342 = 144324
Step 423: 144324 + 342 = 144666
Step 424: 144666 + 342 = 145008
Step 425: 145008 + 342 = 145350
Step 426: 145350 + 342 = 145692
Step 427: 145692 + 342 = 146034
Step 428: 146034 + 342 = 146376
Step 429: 146376 + 342 = 146718
Step 430: 146718 + 342 = 147060
Step 431: 147060 + 342 = 147402
Step 432: 147402 + 342 = 147744
Step 433: 147744 + 342 = 148086
Step 434: 148086 + 342 = 148428
Step 435: 148428 + 342 = 148770
Step 436: 148770 + 342 = 149112
Step 437: 149112 + 342 = 149454
Step 438: 149454 + 342 = 149796
Step 439: 149796 + 342 = 150138
Step 440: 150138 + 342 = 150480
Step 441: 150480 + 342 = 150822
Step 442: 150822 + 342 = 151164
Step 443: 151164 + 342 = 151506
Step 444: 151506 + 342 = 151848
Step 445: 151848 + 342 = 152190
Step 446: 152190 + 342 = 152532
Step 447: 152532 + 342 = 152874
Step 448: 152874 + 342 = 153216
Step 449: 153216 + 342 = 153558
Step 450: 153558 + 342 = 153900
Step 451: 153900 + 342 = 154242
Step 452: 154242 + 342 = 154584
Step 453: 154584 + 342 = 154926
Step 454: 154926 + 342 = 155268
Step 455: 155268 + 342 = 155610
Step 456: 155610 + 342 = 155952
Step 457: 155952 + 342 = 156294
Step 458: 156294 + 342 = 156636
Step 459: 156636 + 342 = 156978
Step 460: 156978 + 342 = 157320
Step 461: 157320 + 342 = 157662
Step 462: 157662 + 342 = 158004
Step 463: 158004 + 342 = 158346
Step 464: 158346 + 342 = 158688
Step 465: 158688 + 342 = 159030
Step 466: 159030 + 342 = 159372
Step 467: 159372 + 342 = 159714
Step 468: 159714 + 342 = 160056
Step 469: 160056 + 342 = 160398
Step 470: 160398 + 342 = 160740
Step 471: 160740 + 342 = 161082
Step 472: 161082 + 342 = 161424
Step 473: 161424 + 342 = 161766
Step 474: 161766 + 342 = 162108
Step 475: 162108 + 342 = 162450
Step 476: 162450 + 342 = 162792
Step 477: 162792 + 342 = 163134
Step 478: 163134 + 342 = 163476
Step 479: 163476 + 342 = 163818
Step 480: 163818 + 342 = 164160
Step 481: 164160 + 342 = 164502
Step 482: 164502 + 342 = 164844
Step 483: 164844 + 342 = 165186
Step 484: 165186 + 342 = 165528
Step 485: 165528 + 342 = 165870
Step 486: 165870 + 342 = 166212
Step 487: 166212 + 342 = 166554

So, 342*487 = 166554