Without delay, let's solve this. We've got 642 and we will be multiplying it by 479, that is, adding 642 to itself 479 times.
Step 1: 0 + 642 = 642
Step 2: 642 + 642 = 1284
Step 3: 1284 + 642 = 1926
Step 4: 1926 + 642 = 2568
Step 5: 2568 + 642 = 3210
Step 6: 3210 + 642 = 3852
Step 7: 3852 + 642 = 4494
Step 8: 4494 + 642 = 5136
Step 9: 5136 + 642 = 5778
Step 10: 5778 + 642 = 6420
Step 11: 6420 + 642 = 7062
Step 12: 7062 + 642 = 7704
Step 13: 7704 + 642 = 8346
Step 14: 8346 + 642 = 8988
Step 15: 8988 + 642 = 9630
Step 16: 9630 + 642 = 10272
Step 17: 10272 + 642 = 10914
Step 18: 10914 + 642 = 11556
Step 19: 11556 + 642 = 12198
Step 20: 12198 + 642 = 12840
Step 21: 12840 + 642 = 13482
Step 22: 13482 + 642 = 14124
Step 23: 14124 + 642 = 14766
Step 24: 14766 + 642 = 15408
Step 25: 15408 + 642 = 16050
Step 26: 16050 + 642 = 16692
Step 27: 16692 + 642 = 17334
Step 28: 17334 + 642 = 17976
Step 29: 17976 + 642 = 18618
Step 30: 18618 + 642 = 19260
Step 31: 19260 + 642 = 19902
Step 32: 19902 + 642 = 20544
Step 33: 20544 + 642 = 21186
Step 34: 21186 + 642 = 21828
Step 35: 21828 + 642 = 22470
Step 36: 22470 + 642 = 23112
Step 37: 23112 + 642 = 23754
Step 38: 23754 + 642 = 24396
Step 39: 24396 + 642 = 25038
Step 40: 25038 + 642 = 25680
Step 41: 25680 + 642 = 26322
Step 42: 26322 + 642 = 26964
Step 43: 26964 + 642 = 27606
Step 44: 27606 + 642 = 28248
Step 45: 28248 + 642 = 28890
Step 46: 28890 + 642 = 29532
Step 47: 29532 + 642 = 30174
Step 48: 30174 + 642 = 30816
Step 49: 30816 + 642 = 31458
Step 50: 31458 + 642 = 32100
Step 51: 32100 + 642 = 32742
Step 52: 32742 + 642 = 33384
Step 53: 33384 + 642 = 34026
Step 54: 34026 + 642 = 34668
Step 55: 34668 + 642 = 35310
Step 56: 35310 + 642 = 35952
Step 57: 35952 + 642 = 36594
Step 58: 36594 + 642 = 37236
Step 59: 37236 + 642 = 37878
Step 60: 37878 + 642 = 38520
Step 61: 38520 + 642 = 39162
Step 62: 39162 + 642 = 39804
Step 63: 39804 + 642 = 40446
Step 64: 40446 + 642 = 41088
Step 65: 41088 + 642 = 41730
Step 66: 41730 + 642 = 42372
Step 67: 42372 + 642 = 43014
Step 68: 43014 + 642 = 43656
Step 69: 43656 + 642 = 44298
Step 70: 44298 + 642 = 44940
Step 71: 44940 + 642 = 45582
Step 72: 45582 + 642 = 46224
Step 73: 46224 + 642 = 46866
Step 74: 46866 + 642 = 47508
Step 75: 47508 + 642 = 48150
Step 76: 48150 + 642 = 48792
Step 77: 48792 + 642 = 49434
Step 78: 49434 + 642 = 50076
Step 79: 50076 + 642 = 50718
Step 80: 50718 + 642 = 51360
Step 81: 51360 + 642 = 52002
Step 82: 52002 + 642 = 52644
Step 83: 52644 + 642 = 53286
Step 84: 53286 + 642 = 53928
Step 85: 53928 + 642 = 54570
Step 86: 54570 + 642 = 55212
Step 87: 55212 + 642 = 55854
Step 88: 55854 + 642 = 56496
Step 89: 56496 + 642 = 57138
Step 90: 57138 + 642 = 57780
Step 91: 57780 + 642 = 58422
Step 92: 58422 + 642 = 59064
Step 93: 59064 + 642 = 59706
Step 94: 59706 + 642 = 60348
Step 95: 60348 + 642 = 60990
Step 96: 60990 + 642 = 61632
Step 97: 61632 + 642 = 62274
Step 98: 62274 + 642 = 62916
Step 99: 62916 + 642 = 63558
Step 100: 63558 + 642 = 64200
Step 101: 64200 + 642 = 64842
Step 102: 64842 + 642 = 65484
Step 103: 65484 + 642 = 66126
Step 104: 66126 + 642 = 66768
Step 105: 66768 + 642 = 67410
Step 106: 67410 + 642 = 68052
Step 107: 68052 + 642 = 68694
Step 108: 68694 + 642 = 69336
Step 109: 69336 + 642 = 69978
Step 110: 69978 + 642 = 70620
Step 111: 70620 + 642 = 71262
Step 112: 71262 + 642 = 71904
Step 113: 71904 + 642 = 72546
Step 114: 72546 + 642 = 73188
Step 115: 73188 + 642 = 73830
Step 116: 73830 + 642 = 74472
Step 117: 74472 + 642 = 75114
Step 118: 75114 + 642 = 75756
Step 119: 75756 + 642 = 76398
Step 120: 76398 + 642 = 77040
Step 121: 77040 + 642 = 77682
Step 122: 77682 + 642 = 78324
Step 123: 78324 + 642 = 78966
Step 124: 78966 + 642 = 79608
Step 125: 79608 + 642 = 80250
Step 126: 80250 + 642 = 80892
Step 127: 80892 + 642 = 81534
Step 128: 81534 + 642 = 82176
Step 129: 82176 + 642 = 82818
Step 130: 82818 + 642 = 83460
Step 131: 83460 + 642 = 84102
Step 132: 84102 + 642 = 84744
Step 133: 84744 + 642 = 85386
Step 134: 85386 + 642 = 86028
Step 135: 86028 + 642 = 86670
Step 136: 86670 + 642 = 87312
Step 137: 87312 + 642 = 87954
Step 138: 87954 + 642 = 88596
Step 139: 88596 + 642 = 89238
Step 140: 89238 + 642 = 89880
Step 141: 89880 + 642 = 90522
Step 142: 90522 + 642 = 91164
Step 143: 91164 + 642 = 91806
Step 144: 91806 + 642 = 92448
Step 145: 92448 + 642 = 93090
Step 146: 93090 + 642 = 93732
Step 147: 93732 + 642 = 94374
Step 148: 94374 + 642 = 95016
Step 149: 95016 + 642 = 95658
Step 150: 95658 + 642 = 96300
Step 151: 96300 + 642 = 96942
Step 152: 96942 + 642 = 97584
Step 153: 97584 + 642 = 98226
Step 154: 98226 + 642 = 98868
Step 155: 98868 + 642 = 99510
Step 156: 99510 + 642 = 100152
Step 157: 100152 + 642 = 100794
Step 158: 100794 + 642 = 101436
Step 159: 101436 + 642 = 102078
Step 160: 102078 + 642 = 102720
Step 161: 102720 + 642 = 103362
Step 162: 103362 + 642 = 104004
Step 163: 104004 + 642 = 104646
Step 164: 104646 + 642 = 105288
Step 165: 105288 + 642 = 105930
Step 166: 105930 + 642 = 106572
Step 167: 106572 + 642 = 107214
Step 168: 107214 + 642 = 107856
Step 169: 107856 + 642 = 108498
Step 170: 108498 + 642 = 109140
Step 171: 109140 + 642 = 109782
Step 172: 109782 + 642 = 110424
Step 173: 110424 + 642 = 111066
Step 174: 111066 + 642 = 111708
Step 175: 111708 + 642 = 112350
Step 176: 112350 + 642 = 112992
Step 177: 112992 + 642 = 113634
Step 178: 113634 + 642 = 114276
Step 179: 114276 + 642 = 114918
Step 180: 114918 + 642 = 115560
Step 181: 115560 + 642 = 116202
Step 182: 116202 + 642 = 116844
Step 183: 116844 + 642 = 117486
Step 184: 117486 + 642 = 118128
Step 185: 118128 + 642 = 118770
Step 186: 118770 + 642 = 119412
Step 187: 119412 + 642 = 120054
Step 188: 120054 + 642 = 120696
Step 189: 120696 + 642 = 121338
Step 190: 121338 + 642 = 121980
Step 191: 121980 + 642 = 122622
Step 192: 122622 + 642 = 123264
Step 193: 123264 + 642 = 123906
Step 194: 123906 + 642 = 124548
Step 195: 124548 + 642 = 125190
Step 196: 125190 + 642 = 125832
Step 197: 125832 + 642 = 126474
Step 198: 126474 + 642 = 127116
Step 199: 127116 + 642 = 127758
Step 200: 127758 + 642 = 128400
Step 201: 128400 + 642 = 129042
Step 202: 129042 + 642 = 129684
Step 203: 129684 + 642 = 130326
Step 204: 130326 + 642 = 130968
Step 205: 130968 + 642 = 131610
Step 206: 131610 + 642 = 132252
Step 207: 132252 + 642 = 132894
Step 208: 132894 + 642 = 133536
Step 209: 133536 + 642 = 134178
Step 210: 134178 + 642 = 134820
Step 211: 134820 + 642 = 135462
Step 212: 135462 + 642 = 136104
Step 213: 136104 + 642 = 136746
Step 214: 136746 + 642 = 137388
Step 215: 137388 + 642 = 138030
Step 216: 138030 + 642 = 138672
Step 217: 138672 + 642 = 139314
Step 218: 139314 + 642 = 139956
Step 219: 139956 + 642 = 140598
Step 220: 140598 + 642 = 141240
Step 221: 141240 + 642 = 141882
Step 222: 141882 + 642 = 142524
Step 223: 142524 + 642 = 143166
Step 224: 143166 + 642 = 143808
Step 225: 143808 + 642 = 144450
Step 226: 144450 + 642 = 145092
Step 227: 145092 + 642 = 145734
Step 228: 145734 + 642 = 146376
Step 229: 146376 + 642 = 147018
Step 230: 147018 + 642 = 147660
Step 231: 147660 + 642 = 148302
Step 232: 148302 + 642 = 148944
Step 233: 148944 + 642 = 149586
Step 234: 149586 + 642 = 150228
Step 235: 150228 + 642 = 150870
Step 236: 150870 + 642 = 151512
Step 237: 151512 + 642 = 152154
Step 238: 152154 + 642 = 152796
Step 239: 152796 + 642 = 153438
Step 240: 153438 + 642 = 154080
Step 241: 154080 + 642 = 154722
Step 242: 154722 + 642 = 155364
Step 243: 155364 + 642 = 156006
Step 244: 156006 + 642 = 156648
Step 245: 156648 + 642 = 157290
Step 246: 157290 + 642 = 157932
Step 247: 157932 + 642 = 158574
Step 248: 158574 + 642 = 159216
Step 249: 159216 + 642 = 159858
Step 250: 159858 + 642 = 160500
Step 251: 160500 + 642 = 161142
Step 252: 161142 + 642 = 161784
Step 253: 161784 + 642 = 162426
Step 254: 162426 + 642 = 163068
Step 255: 163068 + 642 = 163710
Step 256: 163710 + 642 = 164352
Step 257: 164352 + 642 = 164994
Step 258: 164994 + 642 = 165636
Step 259: 165636 + 642 = 166278
Step 260: 166278 + 642 = 166920
Step 261: 166920 + 642 = 167562
Step 262: 167562 + 642 = 168204
Step 263: 168204 + 642 = 168846
Step 264: 168846 + 642 = 169488
Step 265: 169488 + 642 = 170130
Step 266: 170130 + 642 = 170772
Step 267: 170772 + 642 = 171414
Step 268: 171414 + 642 = 172056
Step 269: 172056 + 642 = 172698
Step 270: 172698 + 642 = 173340
Step 271: 173340 + 642 = 173982
Step 272: 173982 + 642 = 174624
Step 273: 174624 + 642 = 175266
Step 274: 175266 + 642 = 175908
Step 275: 175908 + 642 = 176550
Step 276: 176550 + 642 = 177192
Step 277: 177192 + 642 = 177834
Step 278: 177834 + 642 = 178476
Step 279: 178476 + 642 = 179118
Step 280: 179118 + 642 = 179760
Step 281: 179760 + 642 = 180402
Step 282: 180402 + 642 = 181044
Step 283: 181044 + 642 = 181686
Step 284: 181686 + 642 = 182328
Step 285: 182328 + 642 = 182970
Step 286: 182970 + 642 = 183612
Step 287: 183612 + 642 = 184254
Step 288: 184254 + 642 = 184896
Step 289: 184896 + 642 = 185538
Step 290: 185538 + 642 = 186180
Step 291: 186180 + 642 = 186822
Step 292: 186822 + 642 = 187464
Step 293: 187464 + 642 = 188106
Step 294: 188106 + 642 = 188748
Step 295: 188748 + 642 = 189390
Step 296: 189390 + 642 = 190032
Step 297: 190032 + 642 = 190674
Step 298: 190674 + 642 = 191316
Step 299: 191316 + 642 = 191958
Step 300: 191958 + 642 = 192600
Step 301: 192600 + 642 = 193242
Step 302: 193242 + 642 = 193884
Step 303: 193884 + 642 = 194526
Step 304: 194526 + 642 = 195168
Step 305: 195168 + 642 = 195810
Step 306: 195810 + 642 = 196452
Step 307: 196452 + 642 = 197094
Step 308: 197094 + 642 = 197736
Step 309: 197736 + 642 = 198378
Step 310: 198378 + 642 = 199020
Step 311: 199020 + 642 = 199662
Step 312: 199662 + 642 = 200304
Step 313: 200304 + 642 = 200946
Step 314: 200946 + 642 = 201588
Step 315: 201588 + 642 = 202230
Step 316: 202230 + 642 = 202872
Step 317: 202872 + 642 = 203514
Step 318: 203514 + 642 = 204156
Step 319: 204156 + 642 = 204798
Step 320: 204798 + 642 = 205440
Step 321: 205440 + 642 = 206082
Step 322: 206082 + 642 = 206724
Step 323: 206724 + 642 = 207366
Step 324: 207366 + 642 = 208008
Step 325: 208008 + 642 = 208650
Step 326: 208650 + 642 = 209292
Step 327: 209292 + 642 = 209934
Step 328: 209934 + 642 = 210576
Step 329: 210576 + 642 = 211218
Step 330: 211218 + 642 = 211860
Step 331: 211860 + 642 = 212502
Step 332: 212502 + 642 = 213144
Step 333: 213144 + 642 = 213786
Step 334: 213786 + 642 = 214428
Step 335: 214428 + 642 = 215070
Step 336: 215070 + 642 = 215712
Step 337: 215712 + 642 = 216354
Step 338: 216354 + 642 = 216996
Step 339: 216996 + 642 = 217638
Step 340: 217638 + 642 = 218280
Step 341: 218280 + 642 = 218922
Step 342: 218922 + 642 = 219564
Step 343: 219564 + 642 = 220206
Step 344: 220206 + 642 = 220848
Step 345: 220848 + 642 = 221490
Step 346: 221490 + 642 = 222132
Step 347: 222132 + 642 = 222774
Step 348: 222774 + 642 = 223416
Step 349: 223416 + 642 = 224058
Step 350: 224058 + 642 = 224700
Step 351: 224700 + 642 = 225342
Step 352: 225342 + 642 = 225984
Step 353: 225984 + 642 = 226626
Step 354: 226626 + 642 = 227268
Step 355: 227268 + 642 = 227910
Step 356: 227910 + 642 = 228552
Step 357: 228552 + 642 = 229194
Step 358: 229194 + 642 = 229836
Step 359: 229836 + 642 = 230478
Step 360: 230478 + 642 = 231120
Step 361: 231120 + 642 = 231762
Step 362: 231762 + 642 = 232404
Step 363: 232404 + 642 = 233046
Step 364: 233046 + 642 = 233688
Step 365: 233688 + 642 = 234330
Step 366: 234330 + 642 = 234972
Step 367: 234972 + 642 = 235614
Step 368: 235614 + 642 = 236256
Step 369: 236256 + 642 = 236898
Step 370: 236898 + 642 = 237540
Step 371: 237540 + 642 = 238182
Step 372: 238182 + 642 = 238824
Step 373: 238824 + 642 = 239466
Step 374: 239466 + 642 = 240108
Step 375: 240108 + 642 = 240750
Step 376: 240750 + 642 = 241392
Step 377: 241392 + 642 = 242034
Step 378: 242034 + 642 = 242676
Step 379: 242676 + 642 = 243318
Step 380: 243318 + 642 = 243960
Step 381: 243960 + 642 = 244602
Step 382: 244602 + 642 = 245244
Step 383: 245244 + 642 = 245886
Step 384: 245886 + 642 = 246528
Step 385: 246528 + 642 = 247170
Step 386: 247170 + 642 = 247812
Step 387: 247812 + 642 = 248454
Step 388: 248454 + 642 = 249096
Step 389: 249096 + 642 = 249738
Step 390: 249738 + 642 = 250380
Step 391: 250380 + 642 = 251022
Step 392: 251022 + 642 = 251664
Step 393: 251664 + 642 = 252306
Step 394: 252306 + 642 = 252948
Step 395: 252948 + 642 = 253590
Step 396: 253590 + 642 = 254232
Step 397: 254232 + 642 = 254874
Step 398: 254874 + 642 = 255516
Step 399: 255516 + 642 = 256158
Step 400: 256158 + 642 = 256800
Step 401: 256800 + 642 = 257442
Step 402: 257442 + 642 = 258084
Step 403: 258084 + 642 = 258726
Step 404: 258726 + 642 = 259368
Step 405: 259368 + 642 = 260010
Step 406: 260010 + 642 = 260652
Step 407: 260652 + 642 = 261294
Step 408: 261294 + 642 = 261936
Step 409: 261936 + 642 = 262578
Step 410: 262578 + 642 = 263220
Step 411: 263220 + 642 = 263862
Step 412: 263862 + 642 = 264504
Step 413: 264504 + 642 = 265146
Step 414: 265146 + 642 = 265788
Step 415: 265788 + 642 = 266430
Step 416: 266430 + 642 = 267072
Step 417: 267072 + 642 = 267714
Step 418: 267714 + 642 = 268356
Step 419: 268356 + 642 = 268998
Step 420: 268998 + 642 = 269640
Step 421: 269640 + 642 = 270282
Step 422: 270282 + 642 = 270924
Step 423: 270924 + 642 = 271566
Step 424: 271566 + 642 = 272208
Step 425: 272208 + 642 = 272850
Step 426: 272850 + 642 = 273492
Step 427: 273492 + 642 = 274134
Step 428: 274134 + 642 = 274776
Step 429: 274776 + 642 = 275418
Step 430: 275418 + 642 = 276060
Step 431: 276060 + 642 = 276702
Step 432: 276702 + 642 = 277344
Step 433: 277344 + 642 = 277986
Step 434: 277986 + 642 = 278628
Step 435: 278628 + 642 = 279270
Step 436: 279270 + 642 = 279912
Step 437: 279912 + 642 = 280554
Step 438: 280554 + 642 = 281196
Step 439: 281196 + 642 = 281838
Step 440: 281838 + 642 = 282480
Step 441: 282480 + 642 = 283122
Step 442: 283122 + 642 = 283764
Step 443: 283764 + 642 = 284406
Step 444: 284406 + 642 = 285048
Step 445: 285048 + 642 = 285690
Step 446: 285690 + 642 = 286332
Step 447: 286332 + 642 = 286974
Step 448: 286974 + 642 = 287616
Step 449: 287616 + 642 = 288258
Step 450: 288258 + 642 = 288900
Step 451: 288900 + 642 = 289542
Step 452: 289542 + 642 = 290184
Step 453: 290184 + 642 = 290826
Step 454: 290826 + 642 = 291468
Step 455: 291468 + 642 = 292110
Step 456: 292110 + 642 = 292752
Step 457: 292752 + 642 = 293394
Step 458: 293394 + 642 = 294036
Step 459: 294036 + 642 = 294678
Step 460: 294678 + 642 = 295320
Step 461: 295320 + 642 = 295962
Step 462: 295962 + 642 = 296604
Step 463: 296604 + 642 = 297246
Step 464: 297246 + 642 = 297888
Step 465: 297888 + 642 = 298530
Step 466: 298530 + 642 = 299172
Step 467: 299172 + 642 = 299814
Step 468: 299814 + 642 = 300456
Step 469: 300456 + 642 = 301098
Step 470: 301098 + 642 = 301740
Step 471: 301740 + 642 = 302382
Step 472: 302382 + 642 = 303024
Step 473: 303024 + 642 = 303666
Step 474: 303666 + 642 = 304308
Step 475: 304308 + 642 = 304950
Step 476: 304950 + 642 = 305592
Step 477: 305592 + 642 = 306234
Step 478: 306234 + 642 = 306876
Step 479: 306876 + 642 = 307518

So, 642*479 = 307518