Alright, let's solve this math problem step by step. First, we have the number 638. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 490. So, we're going to take the number 638 and add it to itself 490 times.
Step 1: 0 + 638 = 638
Step 2: 638 + 638 = 1276
Step 3: 1276 + 638 = 1914
Step 4: 1914 + 638 = 2552
Step 5: 2552 + 638 = 3190
Step 6: 3190 + 638 = 3828
Step 7: 3828 + 638 = 4466
Step 8: 4466 + 638 = 5104
Step 9: 5104 + 638 = 5742
Step 10: 5742 + 638 = 6380
Step 11: 6380 + 638 = 7018
Step 12: 7018 + 638 = 7656
Step 13: 7656 + 638 = 8294
Step 14: 8294 + 638 = 8932
Step 15: 8932 + 638 = 9570
Step 16: 9570 + 638 = 10208
Step 17: 10208 + 638 = 10846
Step 18: 10846 + 638 = 11484
Step 19: 11484 + 638 = 12122
Step 20: 12122 + 638 = 12760
Step 21: 12760 + 638 = 13398
Step 22: 13398 + 638 = 14036
Step 23: 14036 + 638 = 14674
Step 24: 14674 + 638 = 15312
Step 25: 15312 + 638 = 15950
Step 26: 15950 + 638 = 16588
Step 27: 16588 + 638 = 17226
Step 28: 17226 + 638 = 17864
Step 29: 17864 + 638 = 18502
Step 30: 18502 + 638 = 19140
Step 31: 19140 + 638 = 19778
Step 32: 19778 + 638 = 20416
Step 33: 20416 + 638 = 21054
Step 34: 21054 + 638 = 21692
Step 35: 21692 + 638 = 22330
Step 36: 22330 + 638 = 22968
Step 37: 22968 + 638 = 23606
Step 38: 23606 + 638 = 24244
Step 39: 24244 + 638 = 24882
Step 40: 24882 + 638 = 25520
Step 41: 25520 + 638 = 26158
Step 42: 26158 + 638 = 26796
Step 43: 26796 + 638 = 27434
Step 44: 27434 + 638 = 28072
Step 45: 28072 + 638 = 28710
Step 46: 28710 + 638 = 29348
Step 47: 29348 + 638 = 29986
Step 48: 29986 + 638 = 30624
Step 49: 30624 + 638 = 31262
Step 50: 31262 + 638 = 31900
Step 51: 31900 + 638 = 32538
Step 52: 32538 + 638 = 33176
Step 53: 33176 + 638 = 33814
Step 54: 33814 + 638 = 34452
Step 55: 34452 + 638 = 35090
Step 56: 35090 + 638 = 35728
Step 57: 35728 + 638 = 36366
Step 58: 36366 + 638 = 37004
Step 59: 37004 + 638 = 37642
Step 60: 37642 + 638 = 38280
Step 61: 38280 + 638 = 38918
Step 62: 38918 + 638 = 39556
Step 63: 39556 + 638 = 40194
Step 64: 40194 + 638 = 40832
Step 65: 40832 + 638 = 41470
Step 66: 41470 + 638 = 42108
Step 67: 42108 + 638 = 42746
Step 68: 42746 + 638 = 43384
Step 69: 43384 + 638 = 44022
Step 70: 44022 + 638 = 44660
Step 71: 44660 + 638 = 45298
Step 72: 45298 + 638 = 45936
Step 73: 45936 + 638 = 46574
Step 74: 46574 + 638 = 47212
Step 75: 47212 + 638 = 47850
Step 76: 47850 + 638 = 48488
Step 77: 48488 + 638 = 49126
Step 78: 49126 + 638 = 49764
Step 79: 49764 + 638 = 50402
Step 80: 50402 + 638 = 51040
Step 81: 51040 + 638 = 51678
Step 82: 51678 + 638 = 52316
Step 83: 52316 + 638 = 52954
Step 84: 52954 + 638 = 53592
Step 85: 53592 + 638 = 54230
Step 86: 54230 + 638 = 54868
Step 87: 54868 + 638 = 55506
Step 88: 55506 + 638 = 56144
Step 89: 56144 + 638 = 56782
Step 90: 56782 + 638 = 57420
Step 91: 57420 + 638 = 58058
Step 92: 58058 + 638 = 58696
Step 93: 58696 + 638 = 59334
Step 94: 59334 + 638 = 59972
Step 95: 59972 + 638 = 60610
Step 96: 60610 + 638 = 61248
Step 97: 61248 + 638 = 61886
Step 98: 61886 + 638 = 62524
Step 99: 62524 + 638 = 63162
Step 100: 63162 + 638 = 63800
Step 101: 63800 + 638 = 64438
Step 102: 64438 + 638 = 65076
Step 103: 65076 + 638 = 65714
Step 104: 65714 + 638 = 66352
Step 105: 66352 + 638 = 66990
Step 106: 66990 + 638 = 67628
Step 107: 67628 + 638 = 68266
Step 108: 68266 + 638 = 68904
Step 109: 68904 + 638 = 69542
Step 110: 69542 + 638 = 70180
Step 111: 70180 + 638 = 70818
Step 112: 70818 + 638 = 71456
Step 113: 71456 + 638 = 72094
Step 114: 72094 + 638 = 72732
Step 115: 72732 + 638 = 73370
Step 116: 73370 + 638 = 74008
Step 117: 74008 + 638 = 74646
Step 118: 74646 + 638 = 75284
Step 119: 75284 + 638 = 75922
Step 120: 75922 + 638 = 76560
Step 121: 76560 + 638 = 77198
Step 122: 77198 + 638 = 77836
Step 123: 77836 + 638 = 78474
Step 124: 78474 + 638 = 79112
Step 125: 79112 + 638 = 79750
Step 126: 79750 + 638 = 80388
Step 127: 80388 + 638 = 81026
Step 128: 81026 + 638 = 81664
Step 129: 81664 + 638 = 82302
Step 130: 82302 + 638 = 82940
Step 131: 82940 + 638 = 83578
Step 132: 83578 + 638 = 84216
Step 133: 84216 + 638 = 84854
Step 134: 84854 + 638 = 85492
Step 135: 85492 + 638 = 86130
Step 136: 86130 + 638 = 86768
Step 137: 86768 + 638 = 87406
Step 138: 87406 + 638 = 88044
Step 139: 88044 + 638 = 88682
Step 140: 88682 + 638 = 89320
Step 141: 89320 + 638 = 89958
Step 142: 89958 + 638 = 90596
Step 143: 90596 + 638 = 91234
Step 144: 91234 + 638 = 91872
Step 145: 91872 + 638 = 92510
Step 146: 92510 + 638 = 93148
Step 147: 93148 + 638 = 93786
Step 148: 93786 + 638 = 94424
Step 149: 94424 + 638 = 95062
Step 150: 95062 + 638 = 95700
Step 151: 95700 + 638 = 96338
Step 152: 96338 + 638 = 96976
Step 153: 96976 + 638 = 97614
Step 154: 97614 + 638 = 98252
Step 155: 98252 + 638 = 98890
Step 156: 98890 + 638 = 99528
Step 157: 99528 + 638 = 100166
Step 158: 100166 + 638 = 100804
Step 159: 100804 + 638 = 101442
Step 160: 101442 + 638 = 102080
Step 161: 102080 + 638 = 102718
Step 162: 102718 + 638 = 103356
Step 163: 103356 + 638 = 103994
Step 164: 103994 + 638 = 104632
Step 165: 104632 + 638 = 105270
Step 166: 105270 + 638 = 105908
Step 167: 105908 + 638 = 106546
Step 168: 106546 + 638 = 107184
Step 169: 107184 + 638 = 107822
Step 170: 107822 + 638 = 108460
Step 171: 108460 + 638 = 109098
Step 172: 109098 + 638 = 109736
Step 173: 109736 + 638 = 110374
Step 174: 110374 + 638 = 111012
Step 175: 111012 + 638 = 111650
Step 176: 111650 + 638 = 112288
Step 177: 112288 + 638 = 112926
Step 178: 112926 + 638 = 113564
Step 179: 113564 + 638 = 114202
Step 180: 114202 + 638 = 114840
Step 181: 114840 + 638 = 115478
Step 182: 115478 + 638 = 116116
Step 183: 116116 + 638 = 116754
Step 184: 116754 + 638 = 117392
Step 185: 117392 + 638 = 118030
Step 186: 118030 + 638 = 118668
Step 187: 118668 + 638 = 119306
Step 188: 119306 + 638 = 119944
Step 189: 119944 + 638 = 120582
Step 190: 120582 + 638 = 121220
Step 191: 121220 + 638 = 121858
Step 192: 121858 + 638 = 122496
Step 193: 122496 + 638 = 123134
Step 194: 123134 + 638 = 123772
Step 195: 123772 + 638 = 124410
Step 196: 124410 + 638 = 125048
Step 197: 125048 + 638 = 125686
Step 198: 125686 + 638 = 126324
Step 199: 126324 + 638 = 126962
Step 200: 126962 + 638 = 127600
Step 201: 127600 + 638 = 128238
Step 202: 128238 + 638 = 128876
Step 203: 128876 + 638 = 129514
Step 204: 129514 + 638 = 130152
Step 205: 130152 + 638 = 130790
Step 206: 130790 + 638 = 131428
Step 207: 131428 + 638 = 132066
Step 208: 132066 + 638 = 132704
Step 209: 132704 + 638 = 133342
Step 210: 133342 + 638 = 133980
Step 211: 133980 + 638 = 134618
Step 212: 134618 + 638 = 135256
Step 213: 135256 + 638 = 135894
Step 214: 135894 + 638 = 136532
Step 215: 136532 + 638 = 137170
Step 216: 137170 + 638 = 137808
Step 217: 137808 + 638 = 138446
Step 218: 138446 + 638 = 139084
Step 219: 139084 + 638 = 139722
Step 220: 139722 + 638 = 140360
Step 221: 140360 + 638 = 140998
Step 222: 140998 + 638 = 141636
Step 223: 141636 + 638 = 142274
Step 224: 142274 + 638 = 142912
Step 225: 142912 + 638 = 143550
Step 226: 143550 + 638 = 144188
Step 227: 144188 + 638 = 144826
Step 228: 144826 + 638 = 145464
Step 229: 145464 + 638 = 146102
Step 230: 146102 + 638 = 146740
Step 231: 146740 + 638 = 147378
Step 232: 147378 + 638 = 148016
Step 233: 148016 + 638 = 148654
Step 234: 148654 + 638 = 149292
Step 235: 149292 + 638 = 149930
Step 236: 149930 + 638 = 150568
Step 237: 150568 + 638 = 151206
Step 238: 151206 + 638 = 151844
Step 239: 151844 + 638 = 152482
Step 240: 152482 + 638 = 153120
Step 241: 153120 + 638 = 153758
Step 242: 153758 + 638 = 154396
Step 243: 154396 + 638 = 155034
Step 244: 155034 + 638 = 155672
Step 245: 155672 + 638 = 156310
Step 246: 156310 + 638 = 156948
Step 247: 156948 + 638 = 157586
Step 248: 157586 + 638 = 158224
Step 249: 158224 + 638 = 158862
Step 250: 158862 + 638 = 159500
Step 251: 159500 + 638 = 160138
Step 252: 160138 + 638 = 160776
Step 253: 160776 + 638 = 161414
Step 254: 161414 + 638 = 162052
Step 255: 162052 + 638 = 162690
Step 256: 162690 + 638 = 163328
Step 257: 163328 + 638 = 163966
Step 258: 163966 + 638 = 164604
Step 259: 164604 + 638 = 165242
Step 260: 165242 + 638 = 165880
Step 261: 165880 + 638 = 166518
Step 262: 166518 + 638 = 167156
Step 263: 167156 + 638 = 167794
Step 264: 167794 + 638 = 168432
Step 265: 168432 + 638 = 169070
Step 266: 169070 + 638 = 169708
Step 267: 169708 + 638 = 170346
Step 268: 170346 + 638 = 170984
Step 269: 170984 + 638 = 171622
Step 270: 171622 + 638 = 172260
Step 271: 172260 + 638 = 172898
Step 272: 172898 + 638 = 173536
Step 273: 173536 + 638 = 174174
Step 274: 174174 + 638 = 174812
Step 275: 174812 + 638 = 175450
Step 276: 175450 + 638 = 176088
Step 277: 176088 + 638 = 176726
Step 278: 176726 + 638 = 177364
Step 279: 177364 + 638 = 178002
Step 280: 178002 + 638 = 178640
Step 281: 178640 + 638 = 179278
Step 282: 179278 + 638 = 179916
Step 283: 179916 + 638 = 180554
Step 284: 180554 + 638 = 181192
Step 285: 181192 + 638 = 181830
Step 286: 181830 + 638 = 182468
Step 287: 182468 + 638 = 183106
Step 288: 183106 + 638 = 183744
Step 289: 183744 + 638 = 184382
Step 290: 184382 + 638 = 185020
Step 291: 185020 + 638 = 185658
Step 292: 185658 + 638 = 186296
Step 293: 186296 + 638 = 186934
Step 294: 186934 + 638 = 187572
Step 295: 187572 + 638 = 188210
Step 296: 188210 + 638 = 188848
Step 297: 188848 + 638 = 189486
Step 298: 189486 + 638 = 190124
Step 299: 190124 + 638 = 190762
Step 300: 190762 + 638 = 191400
Step 301: 191400 + 638 = 192038
Step 302: 192038 + 638 = 192676
Step 303: 192676 + 638 = 193314
Step 304: 193314 + 638 = 193952
Step 305: 193952 + 638 = 194590
Step 306: 194590 + 638 = 195228
Step 307: 195228 + 638 = 195866
Step 308: 195866 + 638 = 196504
Step 309: 196504 + 638 = 197142
Step 310: 197142 + 638 = 197780
Step 311: 197780 + 638 = 198418
Step 312: 198418 + 638 = 199056
Step 313: 199056 + 638 = 199694
Step 314: 199694 + 638 = 200332
Step 315: 200332 + 638 = 200970
Step 316: 200970 + 638 = 201608
Step 317: 201608 + 638 = 202246
Step 318: 202246 + 638 = 202884
Step 319: 202884 + 638 = 203522
Step 320: 203522 + 638 = 204160
Step 321: 204160 + 638 = 204798
Step 322: 204798 + 638 = 205436
Step 323: 205436 + 638 = 206074
Step 324: 206074 + 638 = 206712
Step 325: 206712 + 638 = 207350
Step 326: 207350 + 638 = 207988
Step 327: 207988 + 638 = 208626
Step 328: 208626 + 638 = 209264
Step 329: 209264 + 638 = 209902
Step 330: 209902 + 638 = 210540
Step 331: 210540 + 638 = 211178
Step 332: 211178 + 638 = 211816
Step 333: 211816 + 638 = 212454
Step 334: 212454 + 638 = 213092
Step 335: 213092 + 638 = 213730
Step 336: 213730 + 638 = 214368
Step 337: 214368 + 638 = 215006
Step 338: 215006 + 638 = 215644
Step 339: 215644 + 638 = 216282
Step 340: 216282 + 638 = 216920
Step 341: 216920 + 638 = 217558
Step 342: 217558 + 638 = 218196
Step 343: 218196 + 638 = 218834
Step 344: 218834 + 638 = 219472
Step 345: 219472 + 638 = 220110
Step 346: 220110 + 638 = 220748
Step 347: 220748 + 638 = 221386
Step 348: 221386 + 638 = 222024
Step 349: 222024 + 638 = 222662
Step 350: 222662 + 638 = 223300
Step 351: 223300 + 638 = 223938
Step 352: 223938 + 638 = 224576
Step 353: 224576 + 638 = 225214
Step 354: 225214 + 638 = 225852
Step 355: 225852 + 638 = 226490
Step 356: 226490 + 638 = 227128
Step 357: 227128 + 638 = 227766
Step 358: 227766 + 638 = 228404
Step 359: 228404 + 638 = 229042
Step 360: 229042 + 638 = 229680
Step 361: 229680 + 638 = 230318
Step 362: 230318 + 638 = 230956
Step 363: 230956 + 638 = 231594
Step 364: 231594 + 638 = 232232
Step 365: 232232 + 638 = 232870
Step 366: 232870 + 638 = 233508
Step 367: 233508 + 638 = 234146
Step 368: 234146 + 638 = 234784
Step 369: 234784 + 638 = 235422
Step 370: 235422 + 638 = 236060
Step 371: 236060 + 638 = 236698
Step 372: 236698 + 638 = 237336
Step 373: 237336 + 638 = 237974
Step 374: 237974 + 638 = 238612
Step 375: 238612 + 638 = 239250
Step 376: 239250 + 638 = 239888
Step 377: 239888 + 638 = 240526
Step 378: 240526 + 638 = 241164
Step 379: 241164 + 638 = 241802
Step 380: 241802 + 638 = 242440
Step 381: 242440 + 638 = 243078
Step 382: 243078 + 638 = 243716
Step 383: 243716 + 638 = 244354
Step 384: 244354 + 638 = 244992
Step 385: 244992 + 638 = 245630
Step 386: 245630 + 638 = 246268
Step 387: 246268 + 638 = 246906
Step 388: 246906 + 638 = 247544
Step 389: 247544 + 638 = 248182
Step 390: 248182 + 638 = 248820
Step 391: 248820 + 638 = 249458
Step 392: 249458 + 638 = 250096
Step 393: 250096 + 638 = 250734
Step 394: 250734 + 638 = 251372
Step 395: 251372 + 638 = 252010
Step 396: 252010 + 638 = 252648
Step 397: 252648 + 638 = 253286
Step 398: 253286 + 638 = 253924
Step 399: 253924 + 638 = 254562
Step 400: 254562 + 638 = 255200
Step 401: 255200 + 638 = 255838
Step 402: 255838 + 638 = 256476
Step 403: 256476 + 638 = 257114
Step 404: 257114 + 638 = 257752
Step 405: 257752 + 638 = 258390
Step 406: 258390 + 638 = 259028
Step 407: 259028 + 638 = 259666
Step 408: 259666 + 638 = 260304
Step 409: 260304 + 638 = 260942
Step 410: 260942 + 638 = 261580
Step 411: 261580 + 638 = 262218
Step 412: 262218 + 638 = 262856
Step 413: 262856 + 638 = 263494
Step 414: 263494 + 638 = 264132
Step 415: 264132 + 638 = 264770
Step 416: 264770 + 638 = 265408
Step 417: 265408 + 638 = 266046
Step 418: 266046 + 638 = 266684
Step 419: 266684 + 638 = 267322
Step 420: 267322 + 638 = 267960
Step 421: 267960 + 638 = 268598
Step 422: 268598 + 638 = 269236
Step 423: 269236 + 638 = 269874
Step 424: 269874 + 638 = 270512
Step 425: 270512 + 638 = 271150
Step 426: 271150 + 638 = 271788
Step 427: 271788 + 638 = 272426
Step 428: 272426 + 638 = 273064
Step 429: 273064 + 638 = 273702
Step 430: 273702 + 638 = 274340
Step 431: 274340 + 638 = 274978
Step 432: 274978 + 638 = 275616
Step 433: 275616 + 638 = 276254
Step 434: 276254 + 638 = 276892
Step 435: 276892 + 638 = 277530
Step 436: 277530 + 638 = 278168
Step 437: 278168 + 638 = 278806
Step 438: 278806 + 638 = 279444
Step 439: 279444 + 638 = 280082
Step 440: 280082 + 638 = 280720
Step 441: 280720 + 638 = 281358
Step 442: 281358 + 638 = 281996
Step 443: 281996 + 638 = 282634
Step 444: 282634 + 638 = 283272
Step 445: 283272 + 638 = 283910
Step 446: 283910 + 638 = 284548
Step 447: 284548 + 638 = 285186
Step 448: 285186 + 638 = 285824
Step 449: 285824 + 638 = 286462
Step 450: 286462 + 638 = 287100
Step 451: 287100 + 638 = 287738
Step 452: 287738 + 638 = 288376
Step 453: 288376 + 638 = 289014
Step 454: 289014 + 638 = 289652
Step 455: 289652 + 638 = 290290
Step 456: 290290 + 638 = 290928
Step 457: 290928 + 638 = 291566
Step 458: 291566 + 638 = 292204
Step 459: 292204 + 638 = 292842
Step 460: 292842 + 638 = 293480
Step 461: 293480 + 638 = 294118
Step 462: 294118 + 638 = 294756
Step 463: 294756 + 638 = 295394
Step 464: 295394 + 638 = 296032
Step 465: 296032 + 638 = 296670
Step 466: 296670 + 638 = 297308
Step 467: 297308 + 638 = 297946
Step 468: 297946 + 638 = 298584
Step 469: 298584 + 638 = 299222
Step 470: 299222 + 638 = 299860
Step 471: 299860 + 638 = 300498
Step 472: 300498 + 638 = 301136
Step 473: 301136 + 638 = 301774
Step 474: 301774 + 638 = 302412
Step 475: 302412 + 638 = 303050
Step 476: 303050 + 638 = 303688
Step 477: 303688 + 638 = 304326
Step 478: 304326 + 638 = 304964
Step 479: 304964 + 638 = 305602
Step 480: 305602 + 638 = 306240
Step 481: 306240 + 638 = 306878
Step 482: 306878 + 638 = 307516
Step 483: 307516 + 638 = 308154
Step 484: 308154 + 638 = 308792
Step 485: 308792 + 638 = 309430
Step 486: 309430 + 638 = 310068
Step 487: 310068 + 638 = 310706
Step 488: 310706 + 638 = 311344
Step 489: 311344 + 638 = 311982
Step 490: 311982 + 638 = 312620

So, 638*490 = 312620