Alright, let's solve this math problem step by step. First, we have the number 251. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 420. So, we're going to take the number 251 and add it to itself 420 times.
Step 1: 0 + 251 = 251
Step 2: 251 + 251 = 502
Step 3: 502 + 251 = 753
Step 4: 753 + 251 = 1004
Step 5: 1004 + 251 = 1255
Step 6: 1255 + 251 = 1506
Step 7: 1506 + 251 = 1757
Step 8: 1757 + 251 = 2008
Step 9: 2008 + 251 = 2259
Step 10: 2259 + 251 = 2510
Step 11: 2510 + 251 = 2761
Step 12: 2761 + 251 = 3012
Step 13: 3012 + 251 = 3263
Step 14: 3263 + 251 = 3514
Step 15: 3514 + 251 = 3765
Step 16: 3765 + 251 = 4016
Step 17: 4016 + 251 = 4267
Step 18: 4267 + 251 = 4518
Step 19: 4518 + 251 = 4769
Step 20: 4769 + 251 = 5020
Step 21: 5020 + 251 = 5271
Step 22: 5271 + 251 = 5522
Step 23: 5522 + 251 = 5773
Step 24: 5773 + 251 = 6024
Step 25: 6024 + 251 = 6275
Step 26: 6275 + 251 = 6526
Step 27: 6526 + 251 = 6777
Step 28: 6777 + 251 = 7028
Step 29: 7028 + 251 = 7279
Step 30: 7279 + 251 = 7530
Step 31: 7530 + 251 = 7781
Step 32: 7781 + 251 = 8032
Step 33: 8032 + 251 = 8283
Step 34: 8283 + 251 = 8534
Step 35: 8534 + 251 = 8785
Step 36: 8785 + 251 = 9036
Step 37: 9036 + 251 = 9287
Step 38: 9287 + 251 = 9538
Step 39: 9538 + 251 = 9789
Step 40: 9789 + 251 = 10040
Step 41: 10040 + 251 = 10291
Step 42: 10291 + 251 = 10542
Step 43: 10542 + 251 = 10793
Step 44: 10793 + 251 = 11044
Step 45: 11044 + 251 = 11295
Step 46: 11295 + 251 = 11546
Step 47: 11546 + 251 = 11797
Step 48: 11797 + 251 = 12048
Step 49: 12048 + 251 = 12299
Step 50: 12299 + 251 = 12550
Step 51: 12550 + 251 = 12801
Step 52: 12801 + 251 = 13052
Step 53: 13052 + 251 = 13303
Step 54: 13303 + 251 = 13554
Step 55: 13554 + 251 = 13805
Step 56: 13805 + 251 = 14056
Step 57: 14056 + 251 = 14307
Step 58: 14307 + 251 = 14558
Step 59: 14558 + 251 = 14809
Step 60: 14809 + 251 = 15060
Step 61: 15060 + 251 = 15311
Step 62: 15311 + 251 = 15562
Step 63: 15562 + 251 = 15813
Step 64: 15813 + 251 = 16064
Step 65: 16064 + 251 = 16315
Step 66: 16315 + 251 = 16566
Step 67: 16566 + 251 = 16817
Step 68: 16817 + 251 = 17068
Step 69: 17068 + 251 = 17319
Step 70: 17319 + 251 = 17570
Step 71: 17570 + 251 = 17821
Step 72: 17821 + 251 = 18072
Step 73: 18072 + 251 = 18323
Step 74: 18323 + 251 = 18574
Step 75: 18574 + 251 = 18825
Step 76: 18825 + 251 = 19076
Step 77: 19076 + 251 = 19327
Step 78: 19327 + 251 = 19578
Step 79: 19578 + 251 = 19829
Step 80: 19829 + 251 = 20080
Step 81: 20080 + 251 = 20331
Step 82: 20331 + 251 = 20582
Step 83: 20582 + 251 = 20833
Step 84: 20833 + 251 = 21084
Step 85: 21084 + 251 = 21335
Step 86: 21335 + 251 = 21586
Step 87: 21586 + 251 = 21837
Step 88: 21837 + 251 = 22088
Step 89: 22088 + 251 = 22339
Step 90: 22339 + 251 = 22590
Step 91: 22590 + 251 = 22841
Step 92: 22841 + 251 = 23092
Step 93: 23092 + 251 = 23343
Step 94: 23343 + 251 = 23594
Step 95: 23594 + 251 = 23845
Step 96: 23845 + 251 = 24096
Step 97: 24096 + 251 = 24347
Step 98: 24347 + 251 = 24598
Step 99: 24598 + 251 = 24849
Step 100: 24849 + 251 = 25100
Step 101: 25100 + 251 = 25351
Step 102: 25351 + 251 = 25602
Step 103: 25602 + 251 = 25853
Step 104: 25853 + 251 = 26104
Step 105: 26104 + 251 = 26355
Step 106: 26355 + 251 = 26606
Step 107: 26606 + 251 = 26857
Step 108: 26857 + 251 = 27108
Step 109: 27108 + 251 = 27359
Step 110: 27359 + 251 = 27610
Step 111: 27610 + 251 = 27861
Step 112: 27861 + 251 = 28112
Step 113: 28112 + 251 = 28363
Step 114: 28363 + 251 = 28614
Step 115: 28614 + 251 = 28865
Step 116: 28865 + 251 = 29116
Step 117: 29116 + 251 = 29367
Step 118: 29367 + 251 = 29618
Step 119: 29618 + 251 = 29869
Step 120: 29869 + 251 = 30120
Step 121: 30120 + 251 = 30371
Step 122: 30371 + 251 = 30622
Step 123: 30622 + 251 = 30873
Step 124: 30873 + 251 = 31124
Step 125: 31124 + 251 = 31375
Step 126: 31375 + 251 = 31626
Step 127: 31626 + 251 = 31877
Step 128: 31877 + 251 = 32128
Step 129: 32128 + 251 = 32379
Step 130: 32379 + 251 = 32630
Step 131: 32630 + 251 = 32881
Step 132: 32881 + 251 = 33132
Step 133: 33132 + 251 = 33383
Step 134: 33383 + 251 = 33634
Step 135: 33634 + 251 = 33885
Step 136: 33885 + 251 = 34136
Step 137: 34136 + 251 = 34387
Step 138: 34387 + 251 = 34638
Step 139: 34638 + 251 = 34889
Step 140: 34889 + 251 = 35140
Step 141: 35140 + 251 = 35391
Step 142: 35391 + 251 = 35642
Step 143: 35642 + 251 = 35893
Step 144: 35893 + 251 = 36144
Step 145: 36144 + 251 = 36395
Step 146: 36395 + 251 = 36646
Step 147: 36646 + 251 = 36897
Step 148: 36897 + 251 = 37148
Step 149: 37148 + 251 = 37399
Step 150: 37399 + 251 = 37650
Step 151: 37650 + 251 = 37901
Step 152: 37901 + 251 = 38152
Step 153: 38152 + 251 = 38403
Step 154: 38403 + 251 = 38654
Step 155: 38654 + 251 = 38905
Step 156: 38905 + 251 = 39156
Step 157: 39156 + 251 = 39407
Step 158: 39407 + 251 = 39658
Step 159: 39658 + 251 = 39909
Step 160: 39909 + 251 = 40160
Step 161: 40160 + 251 = 40411
Step 162: 40411 + 251 = 40662
Step 163: 40662 + 251 = 40913
Step 164: 40913 + 251 = 41164
Step 165: 41164 + 251 = 41415
Step 166: 41415 + 251 = 41666
Step 167: 41666 + 251 = 41917
Step 168: 41917 + 251 = 42168
Step 169: 42168 + 251 = 42419
Step 170: 42419 + 251 = 42670
Step 171: 42670 + 251 = 42921
Step 172: 42921 + 251 = 43172
Step 173: 43172 + 251 = 43423
Step 174: 43423 + 251 = 43674
Step 175: 43674 + 251 = 43925
Step 176: 43925 + 251 = 44176
Step 177: 44176 + 251 = 44427
Step 178: 44427 + 251 = 44678
Step 179: 44678 + 251 = 44929
Step 180: 44929 + 251 = 45180
Step 181: 45180 + 251 = 45431
Step 182: 45431 + 251 = 45682
Step 183: 45682 + 251 = 45933
Step 184: 45933 + 251 = 46184
Step 185: 46184 + 251 = 46435
Step 186: 46435 + 251 = 46686
Step 187: 46686 + 251 = 46937
Step 188: 46937 + 251 = 47188
Step 189: 47188 + 251 = 47439
Step 190: 47439 + 251 = 47690
Step 191: 47690 + 251 = 47941
Step 192: 47941 + 251 = 48192
Step 193: 48192 + 251 = 48443
Step 194: 48443 + 251 = 48694
Step 195: 48694 + 251 = 48945
Step 196: 48945 + 251 = 49196
Step 197: 49196 + 251 = 49447
Step 198: 49447 + 251 = 49698
Step 199: 49698 + 251 = 49949
Step 200: 49949 + 251 = 50200
Step 201: 50200 + 251 = 50451
Step 202: 50451 + 251 = 50702
Step 203: 50702 + 251 = 50953
Step 204: 50953 + 251 = 51204
Step 205: 51204 + 251 = 51455
Step 206: 51455 + 251 = 51706
Step 207: 51706 + 251 = 51957
Step 208: 51957 + 251 = 52208
Step 209: 52208 + 251 = 52459
Step 210: 52459 + 251 = 52710
Step 211: 52710 + 251 = 52961
Step 212: 52961 + 251 = 53212
Step 213: 53212 + 251 = 53463
Step 214: 53463 + 251 = 53714
Step 215: 53714 + 251 = 53965
Step 216: 53965 + 251 = 54216
Step 217: 54216 + 251 = 54467
Step 218: 54467 + 251 = 54718
Step 219: 54718 + 251 = 54969
Step 220: 54969 + 251 = 55220
Step 221: 55220 + 251 = 55471
Step 222: 55471 + 251 = 55722
Step 223: 55722 + 251 = 55973
Step 224: 55973 + 251 = 56224
Step 225: 56224 + 251 = 56475
Step 226: 56475 + 251 = 56726
Step 227: 56726 + 251 = 56977
Step 228: 56977 + 251 = 57228
Step 229: 57228 + 251 = 57479
Step 230: 57479 + 251 = 57730
Step 231: 57730 + 251 = 57981
Step 232: 57981 + 251 = 58232
Step 233: 58232 + 251 = 58483
Step 234: 58483 + 251 = 58734
Step 235: 58734 + 251 = 58985
Step 236: 58985 + 251 = 59236
Step 237: 59236 + 251 = 59487
Step 238: 59487 + 251 = 59738
Step 239: 59738 + 251 = 59989
Step 240: 59989 + 251 = 60240
Step 241: 60240 + 251 = 60491
Step 242: 60491 + 251 = 60742
Step 243: 60742 + 251 = 60993
Step 244: 60993 + 251 = 61244
Step 245: 61244 + 251 = 61495
Step 246: 61495 + 251 = 61746
Step 247: 61746 + 251 = 61997
Step 248: 61997 + 251 = 62248
Step 249: 62248 + 251 = 62499
Step 250: 62499 + 251 = 62750
Step 251: 62750 + 251 = 63001
Step 252: 63001 + 251 = 63252
Step 253: 63252 + 251 = 63503
Step 254: 63503 + 251 = 63754
Step 255: 63754 + 251 = 64005
Step 256: 64005 + 251 = 64256
Step 257: 64256 + 251 = 64507
Step 258: 64507 + 251 = 64758
Step 259: 64758 + 251 = 65009
Step 260: 65009 + 251 = 65260
Step 261: 65260 + 251 = 65511
Step 262: 65511 + 251 = 65762
Step 263: 65762 + 251 = 66013
Step 264: 66013 + 251 = 66264
Step 265: 66264 + 251 = 66515
Step 266: 66515 + 251 = 66766
Step 267: 66766 + 251 = 67017
Step 268: 67017 + 251 = 67268
Step 269: 67268 + 251 = 67519
Step 270: 67519 + 251 = 67770
Step 271: 67770 + 251 = 68021
Step 272: 68021 + 251 = 68272
Step 273: 68272 + 251 = 68523
Step 274: 68523 + 251 = 68774
Step 275: 68774 + 251 = 69025
Step 276: 69025 + 251 = 69276
Step 277: 69276 + 251 = 69527
Step 278: 69527 + 251 = 69778
Step 279: 69778 + 251 = 70029
Step 280: 70029 + 251 = 70280
Step 281: 70280 + 251 = 70531
Step 282: 70531 + 251 = 70782
Step 283: 70782 + 251 = 71033
Step 284: 71033 + 251 = 71284
Step 285: 71284 + 251 = 71535
Step 286: 71535 + 251 = 71786
Step 287: 71786 + 251 = 72037
Step 288: 72037 + 251 = 72288
Step 289: 72288 + 251 = 72539
Step 290: 72539 + 251 = 72790
Step 291: 72790 + 251 = 73041
Step 292: 73041 + 251 = 73292
Step 293: 73292 + 251 = 73543
Step 294: 73543 + 251 = 73794
Step 295: 73794 + 251 = 74045
Step 296: 74045 + 251 = 74296
Step 297: 74296 + 251 = 74547
Step 298: 74547 + 251 = 74798
Step 299: 74798 + 251 = 75049
Step 300: 75049 + 251 = 75300
Step 301: 75300 + 251 = 75551
Step 302: 75551 + 251 = 75802
Step 303: 75802 + 251 = 76053
Step 304: 76053 + 251 = 76304
Step 305: 76304 + 251 = 76555
Step 306: 76555 + 251 = 76806
Step 307: 76806 + 251 = 77057
Step 308: 77057 + 251 = 77308
Step 309: 77308 + 251 = 77559
Step 310: 77559 + 251 = 77810
Step 311: 77810 + 251 = 78061
Step 312: 78061 + 251 = 78312
Step 313: 78312 + 251 = 78563
Step 314: 78563 + 251 = 78814
Step 315: 78814 + 251 = 79065
Step 316: 79065 + 251 = 79316
Step 317: 79316 + 251 = 79567
Step 318: 79567 + 251 = 79818
Step 319: 79818 + 251 = 80069
Step 320: 80069 + 251 = 80320
Step 321: 80320 + 251 = 80571
Step 322: 80571 + 251 = 80822
Step 323: 80822 + 251 = 81073
Step 324: 81073 + 251 = 81324
Step 325: 81324 + 251 = 81575
Step 326: 81575 + 251 = 81826
Step 327: 81826 + 251 = 82077
Step 328: 82077 + 251 = 82328
Step 329: 82328 + 251 = 82579
Step 330: 82579 + 251 = 82830
Step 331: 82830 + 251 = 83081
Step 332: 83081 + 251 = 83332
Step 333: 83332 + 251 = 83583
Step 334: 83583 + 251 = 83834
Step 335: 83834 + 251 = 84085
Step 336: 84085 + 251 = 84336
Step 337: 84336 + 251 = 84587
Step 338: 84587 + 251 = 84838
Step 339: 84838 + 251 = 85089
Step 340: 85089 + 251 = 85340
Step 341: 85340 + 251 = 85591
Step 342: 85591 + 251 = 85842
Step 343: 85842 + 251 = 86093
Step 344: 86093 + 251 = 86344
Step 345: 86344 + 251 = 86595
Step 346: 86595 + 251 = 86846
Step 347: 86846 + 251 = 87097
Step 348: 87097 + 251 = 87348
Step 349: 87348 + 251 = 87599
Step 350: 87599 + 251 = 87850
Step 351: 87850 + 251 = 88101
Step 352: 88101 + 251 = 88352
Step 353: 88352 + 251 = 88603
Step 354: 88603 + 251 = 88854
Step 355: 88854 + 251 = 89105
Step 356: 89105 + 251 = 89356
Step 357: 89356 + 251 = 89607
Step 358: 89607 + 251 = 89858
Step 359: 89858 + 251 = 90109
Step 360: 90109 + 251 = 90360
Step 361: 90360 + 251 = 90611
Step 362: 90611 + 251 = 90862
Step 363: 90862 + 251 = 91113
Step 364: 91113 + 251 = 91364
Step 365: 91364 + 251 = 91615
Step 366: 91615 + 251 = 91866
Step 367: 91866 + 251 = 92117
Step 368: 92117 + 251 = 92368
Step 369: 92368 + 251 = 92619
Step 370: 92619 + 251 = 92870
Step 371: 92870 + 251 = 93121
Step 372: 93121 + 251 = 93372
Step 373: 93372 + 251 = 93623
Step 374: 93623 + 251 = 93874
Step 375: 93874 + 251 = 94125
Step 376: 94125 + 251 = 94376
Step 377: 94376 + 251 = 94627
Step 378: 94627 + 251 = 94878
Step 379: 94878 + 251 = 95129
Step 380: 95129 + 251 = 95380
Step 381: 95380 + 251 = 95631
Step 382: 95631 + 251 = 95882
Step 383: 95882 + 251 = 96133
Step 384: 96133 + 251 = 96384
Step 385: 96384 + 251 = 96635
Step 386: 96635 + 251 = 96886
Step 387: 96886 + 251 = 97137
Step 388: 97137 + 251 = 97388
Step 389: 97388 + 251 = 97639
Step 390: 97639 + 251 = 97890
Step 391: 97890 + 251 = 98141
Step 392: 98141 + 251 = 98392
Step 393: 98392 + 251 = 98643
Step 394: 98643 + 251 = 98894
Step 395: 98894 + 251 = 99145
Step 396: 99145 + 251 = 99396
Step 397: 99396 + 251 = 99647
Step 398: 99647 + 251 = 99898
Step 399: 99898 + 251 = 100149
Step 400: 100149 + 251 = 100400
Step 401: 100400 + 251 = 100651
Step 402: 100651 + 251 = 100902
Step 403: 100902 + 251 = 101153
Step 404: 101153 + 251 = 101404
Step 405: 101404 + 251 = 101655
Step 406: 101655 + 251 = 101906
Step 407: 101906 + 251 = 102157
Step 408: 102157 + 251 = 102408
Step 409: 102408 + 251 = 102659
Step 410: 102659 + 251 = 102910
Step 411: 102910 + 251 = 103161
Step 412: 103161 + 251 = 103412
Step 413: 103412 + 251 = 103663
Step 414: 103663 + 251 = 103914
Step 415: 103914 + 251 = 104165
Step 416: 104165 + 251 = 104416
Step 417: 104416 + 251 = 104667
Step 418: 104667 + 251 = 104918
Step 419: 104918 + 251 = 105169
Step 420: 105169 + 251 = 105420

So, 251*420 = 105420