Alright, let's solve this math problem step by step. First, we have the number 858. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 421. So, we're going to take the number 858 and add it to itself 421 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574
Step 4: 2574 + 858 = 3432
Step 5: 3432 + 858 = 4290
Step 6: 4290 + 858 = 5148
Step 7: 5148 + 858 = 6006
Step 8: 6006 + 858 = 6864
Step 9: 6864 + 858 = 7722
Step 10: 7722 + 858 = 8580
Step 11: 8580 + 858 = 9438
Step 12: 9438 + 858 = 10296
Step 13: 10296 + 858 = 11154
Step 14: 11154 + 858 = 12012
Step 15: 12012 + 858 = 12870
Step 16: 12870 + 858 = 13728
Step 17: 13728 + 858 = 14586
Step 18: 14586 + 858 = 15444
Step 19: 15444 + 858 = 16302
Step 20: 16302 + 858 = 17160
Step 21: 17160 + 858 = 18018
Step 22: 18018 + 858 = 18876
Step 23: 18876 + 858 = 19734
Step 24: 19734 + 858 = 20592
Step 25: 20592 + 858 = 21450
Step 26: 21450 + 858 = 22308
Step 27: 22308 + 858 = 23166
Step 28: 23166 + 858 = 24024
Step 29: 24024 + 858 = 24882
Step 30: 24882 + 858 = 25740
Step 31: 25740 + 858 = 26598
Step 32: 26598 + 858 = 27456
Step 33: 27456 + 858 = 28314
Step 34: 28314 + 858 = 29172
Step 35: 29172 + 858 = 30030
Step 36: 30030 + 858 = 30888
Step 37: 30888 + 858 = 31746
Step 38: 31746 + 858 = 32604
Step 39: 32604 + 858 = 33462
Step 40: 33462 + 858 = 34320
Step 41: 34320 + 858 = 35178
Step 42: 35178 + 858 = 36036
Step 43: 36036 + 858 = 36894
Step 44: 36894 + 858 = 37752
Step 45: 37752 + 858 = 38610
Step 46: 38610 + 858 = 39468
Step 47: 39468 + 858 = 40326
Step 48: 40326 + 858 = 41184
Step 49: 41184 + 858 = 42042
Step 50: 42042 + 858 = 42900
Step 51: 42900 + 858 = 43758
Step 52: 43758 + 858 = 44616
Step 53: 44616 + 858 = 45474
Step 54: 45474 + 858 = 46332
Step 55: 46332 + 858 = 47190
Step 56: 47190 + 858 = 48048
Step 57: 48048 + 858 = 48906
Step 58: 48906 + 858 = 49764
Step 59: 49764 + 858 = 50622
Step 60: 50622 + 858 = 51480
Step 61: 51480 + 858 = 52338
Step 62: 52338 + 858 = 53196
Step 63: 53196 + 858 = 54054
Step 64: 54054 + 858 = 54912
Step 65: 54912 + 858 = 55770
Step 66: 55770 + 858 = 56628
Step 67: 56628 + 858 = 57486
Step 68: 57486 + 858 = 58344
Step 69: 58344 + 858 = 59202
Step 70: 59202 + 858 = 60060
Step 71: 60060 + 858 = 60918
Step 72: 60918 + 858 = 61776
Step 73: 61776 + 858 = 62634
Step 74: 62634 + 858 = 63492
Step 75: 63492 + 858 = 64350
Step 76: 64350 + 858 = 65208
Step 77: 65208 + 858 = 66066
Step 78: 66066 + 858 = 66924
Step 79: 66924 + 858 = 67782
Step 80: 67782 + 858 = 68640
Step 81: 68640 + 858 = 69498
Step 82: 69498 + 858 = 70356
Step 83: 70356 + 858 = 71214
Step 84: 71214 + 858 = 72072
Step 85: 72072 + 858 = 72930
Step 86: 72930 + 858 = 73788
Step 87: 73788 + 858 = 74646
Step 88: 74646 + 858 = 75504
Step 89: 75504 + 858 = 76362
Step 90: 76362 + 858 = 77220
Step 91: 77220 + 858 = 78078
Step 92: 78078 + 858 = 78936
Step 93: 78936 + 858 = 79794
Step 94: 79794 + 858 = 80652
Step 95: 80652 + 858 = 81510
Step 96: 81510 + 858 = 82368
Step 97: 82368 + 858 = 83226
Step 98: 83226 + 858 = 84084
Step 99: 84084 + 858 = 84942
Step 100: 84942 + 858 = 85800
Step 101: 85800 + 858 = 86658
Step 102: 86658 + 858 = 87516
Step 103: 87516 + 858 = 88374
Step 104: 88374 + 858 = 89232
Step 105: 89232 + 858 = 90090
Step 106: 90090 + 858 = 90948
Step 107: 90948 + 858 = 91806
Step 108: 91806 + 858 = 92664
Step 109: 92664 + 858 = 93522
Step 110: 93522 + 858 = 94380
Step 111: 94380 + 858 = 95238
Step 112: 95238 + 858 = 96096
Step 113: 96096 + 858 = 96954
Step 114: 96954 + 858 = 97812
Step 115: 97812 + 858 = 98670
Step 116: 98670 + 858 = 99528
Step 117: 99528 + 858 = 100386
Step 118: 100386 + 858 = 101244
Step 119: 101244 + 858 = 102102
Step 120: 102102 + 858 = 102960
Step 121: 102960 + 858 = 103818
Step 122: 103818 + 858 = 104676
Step 123: 104676 + 858 = 105534
Step 124: 105534 + 858 = 106392
Step 125: 106392 + 858 = 107250
Step 126: 107250 + 858 = 108108
Step 127: 108108 + 858 = 108966
Step 128: 108966 + 858 = 109824
Step 129: 109824 + 858 = 110682
Step 130: 110682 + 858 = 111540
Step 131: 111540 + 858 = 112398
Step 132: 112398 + 858 = 113256
Step 133: 113256 + 858 = 114114
Step 134: 114114 + 858 = 114972
Step 135: 114972 + 858 = 115830
Step 136: 115830 + 858 = 116688
Step 137: 116688 + 858 = 117546
Step 138: 117546 + 858 = 118404
Step 139: 118404 + 858 = 119262
Step 140: 119262 + 858 = 120120
Step 141: 120120 + 858 = 120978
Step 142: 120978 + 858 = 121836
Step 143: 121836 + 858 = 122694
Step 144: 122694 + 858 = 123552
Step 145: 123552 + 858 = 124410
Step 146: 124410 + 858 = 125268
Step 147: 125268 + 858 = 126126
Step 148: 126126 + 858 = 126984
Step 149: 126984 + 858 = 127842
Step 150: 127842 + 858 = 128700
Step 151: 128700 + 858 = 129558
Step 152: 129558 + 858 = 130416
Step 153: 130416 + 858 = 131274
Step 154: 131274 + 858 = 132132
Step 155: 132132 + 858 = 132990
Step 156: 132990 + 858 = 133848
Step 157: 133848 + 858 = 134706
Step 158: 134706 + 858 = 135564
Step 159: 135564 + 858 = 136422
Step 160: 136422 + 858 = 137280
Step 161: 137280 + 858 = 138138
Step 162: 138138 + 858 = 138996
Step 163: 138996 + 858 = 139854
Step 164: 139854 + 858 = 140712
Step 165: 140712 + 858 = 141570
Step 166: 141570 + 858 = 142428
Step 167: 142428 + 858 = 143286
Step 168: 143286 + 858 = 144144
Step 169: 144144 + 858 = 145002
Step 170: 145002 + 858 = 145860
Step 171: 145860 + 858 = 146718
Step 172: 146718 + 858 = 147576
Step 173: 147576 + 858 = 148434
Step 174: 148434 + 858 = 149292
Step 175: 149292 + 858 = 150150
Step 176: 150150 + 858 = 151008
Step 177: 151008 + 858 = 151866
Step 178: 151866 + 858 = 152724
Step 179: 152724 + 858 = 153582
Step 180: 153582 + 858 = 154440
Step 181: 154440 + 858 = 155298
Step 182: 155298 + 858 = 156156
Step 183: 156156 + 858 = 157014
Step 184: 157014 + 858 = 157872
Step 185: 157872 + 858 = 158730
Step 186: 158730 + 858 = 159588
Step 187: 159588 + 858 = 160446
Step 188: 160446 + 858 = 161304
Step 189: 161304 + 858 = 162162
Step 190: 162162 + 858 = 163020
Step 191: 163020 + 858 = 163878
Step 192: 163878 + 858 = 164736
Step 193: 164736 + 858 = 165594
Step 194: 165594 + 858 = 166452
Step 195: 166452 + 858 = 167310
Step 196: 167310 + 858 = 168168
Step 197: 168168 + 858 = 169026
Step 198: 169026 + 858 = 169884
Step 199: 169884 + 858 = 170742
Step 200: 170742 + 858 = 171600
Step 201: 171600 + 858 = 172458
Step 202: 172458 + 858 = 173316
Step 203: 173316 + 858 = 174174
Step 204: 174174 + 858 = 175032
Step 205: 175032 + 858 = 175890
Step 206: 175890 + 858 = 176748
Step 207: 176748 + 858 = 177606
Step 208: 177606 + 858 = 178464
Step 209: 178464 + 858 = 179322
Step 210: 179322 + 858 = 180180
Step 211: 180180 + 858 = 181038
Step 212: 181038 + 858 = 181896
Step 213: 181896 + 858 = 182754
Step 214: 182754 + 858 = 183612
Step 215: 183612 + 858 = 184470
Step 216: 184470 + 858 = 185328
Step 217: 185328 + 858 = 186186
Step 218: 186186 + 858 = 187044
Step 219: 187044 + 858 = 187902
Step 220: 187902 + 858 = 188760
Step 221: 188760 + 858 = 189618
Step 222: 189618 + 858 = 190476
Step 223: 190476 + 858 = 191334
Step 224: 191334 + 858 = 192192
Step 225: 192192 + 858 = 193050
Step 226: 193050 + 858 = 193908
Step 227: 193908 + 858 = 194766
Step 228: 194766 + 858 = 195624
Step 229: 195624 + 858 = 196482
Step 230: 196482 + 858 = 197340
Step 231: 197340 + 858 = 198198
Step 232: 198198 + 858 = 199056
Step 233: 199056 + 858 = 199914
Step 234: 199914 + 858 = 200772
Step 235: 200772 + 858 = 201630
Step 236: 201630 + 858 = 202488
Step 237: 202488 + 858 = 203346
Step 238: 203346 + 858 = 204204
Step 239: 204204 + 858 = 205062
Step 240: 205062 + 858 = 205920
Step 241: 205920 + 858 = 206778
Step 242: 206778 + 858 = 207636
Step 243: 207636 + 858 = 208494
Step 244: 208494 + 858 = 209352
Step 245: 209352 + 858 = 210210
Step 246: 210210 + 858 = 211068
Step 247: 211068 + 858 = 211926
Step 248: 211926 + 858 = 212784
Step 249: 212784 + 858 = 213642
Step 250: 213642 + 858 = 214500
Step 251: 214500 + 858 = 215358
Step 252: 215358 + 858 = 216216
Step 253: 216216 + 858 = 217074
Step 254: 217074 + 858 = 217932
Step 255: 217932 + 858 = 218790
Step 256: 218790 + 858 = 219648
Step 257: 219648 + 858 = 220506
Step 258: 220506 + 858 = 221364
Step 259: 221364 + 858 = 222222
Step 260: 222222 + 858 = 223080
Step 261: 223080 + 858 = 223938
Step 262: 223938 + 858 = 224796
Step 263: 224796 + 858 = 225654
Step 264: 225654 + 858 = 226512
Step 265: 226512 + 858 = 227370
Step 266: 227370 + 858 = 228228
Step 267: 228228 + 858 = 229086
Step 268: 229086 + 858 = 229944
Step 269: 229944 + 858 = 230802
Step 270: 230802 + 858 = 231660
Step 271: 231660 + 858 = 232518
Step 272: 232518 + 858 = 233376
Step 273: 233376 + 858 = 234234
Step 274: 234234 + 858 = 235092
Step 275: 235092 + 858 = 235950
Step 276: 235950 + 858 = 236808
Step 277: 236808 + 858 = 237666
Step 278: 237666 + 858 = 238524
Step 279: 238524 + 858 = 239382
Step 280: 239382 + 858 = 240240
Step 281: 240240 + 858 = 241098
Step 282: 241098 + 858 = 241956
Step 283: 241956 + 858 = 242814
Step 284: 242814 + 858 = 243672
Step 285: 243672 + 858 = 244530
Step 286: 244530 + 858 = 245388
Step 287: 245388 + 858 = 246246
Step 288: 246246 + 858 = 247104
Step 289: 247104 + 858 = 247962
Step 290: 247962 + 858 = 248820
Step 291: 248820 + 858 = 249678
Step 292: 249678 + 858 = 250536
Step 293: 250536 + 858 = 251394
Step 294: 251394 + 858 = 252252
Step 295: 252252 + 858 = 253110
Step 296: 253110 + 858 = 253968
Step 297: 253968 + 858 = 254826
Step 298: 254826 + 858 = 255684
Step 299: 255684 + 858 = 256542
Step 300: 256542 + 858 = 257400
Step 301: 257400 + 858 = 258258
Step 302: 258258 + 858 = 259116
Step 303: 259116 + 858 = 259974
Step 304: 259974 + 858 = 260832
Step 305: 260832 + 858 = 261690
Step 306: 261690 + 858 = 262548
Step 307: 262548 + 858 = 263406
Step 308: 263406 + 858 = 264264
Step 309: 264264 + 858 = 265122
Step 310: 265122 + 858 = 265980
Step 311: 265980 + 858 = 266838
Step 312: 266838 + 858 = 267696
Step 313: 267696 + 858 = 268554
Step 314: 268554 + 858 = 269412
Step 315: 269412 + 858 = 270270
Step 316: 270270 + 858 = 271128
Step 317: 271128 + 858 = 271986
Step 318: 271986 + 858 = 272844
Step 319: 272844 + 858 = 273702
Step 320: 273702 + 858 = 274560
Step 321: 274560 + 858 = 275418
Step 322: 275418 + 858 = 276276
Step 323: 276276 + 858 = 277134
Step 324: 277134 + 858 = 277992
Step 325: 277992 + 858 = 278850
Step 326: 278850 + 858 = 279708
Step 327: 279708 + 858 = 280566
Step 328: 280566 + 858 = 281424
Step 329: 281424 + 858 = 282282
Step 330: 282282 + 858 = 283140
Step 331: 283140 + 858 = 283998
Step 332: 283998 + 858 = 284856
Step 333: 284856 + 858 = 285714
Step 334: 285714 + 858 = 286572
Step 335: 286572 + 858 = 287430
Step 336: 287430 + 858 = 288288
Step 337: 288288 + 858 = 289146
Step 338: 289146 + 858 = 290004
Step 339: 290004 + 858 = 290862
Step 340: 290862 + 858 = 291720
Step 341: 291720 + 858 = 292578
Step 342: 292578 + 858 = 293436
Step 343: 293436 + 858 = 294294
Step 344: 294294 + 858 = 295152
Step 345: 295152 + 858 = 296010
Step 346: 296010 + 858 = 296868
Step 347: 296868 + 858 = 297726
Step 348: 297726 + 858 = 298584
Step 349: 298584 + 858 = 299442
Step 350: 299442 + 858 = 300300
Step 351: 300300 + 858 = 301158
Step 352: 301158 + 858 = 302016
Step 353: 302016 + 858 = 302874
Step 354: 302874 + 858 = 303732
Step 355: 303732 + 858 = 304590
Step 356: 304590 + 858 = 305448
Step 357: 305448 + 858 = 306306
Step 358: 306306 + 858 = 307164
Step 359: 307164 + 858 = 308022
Step 360: 308022 + 858 = 308880
Step 361: 308880 + 858 = 309738
Step 362: 309738 + 858 = 310596
Step 363: 310596 + 858 = 311454
Step 364: 311454 + 858 = 312312
Step 365: 312312 + 858 = 313170
Step 366: 313170 + 858 = 314028
Step 367: 314028 + 858 = 314886
Step 368: 314886 + 858 = 315744
Step 369: 315744 + 858 = 316602
Step 370: 316602 + 858 = 317460
Step 371: 317460 + 858 = 318318
Step 372: 318318 + 858 = 319176
Step 373: 319176 + 858 = 320034
Step 374: 320034 + 858 = 320892
Step 375: 320892 + 858 = 321750
Step 376: 321750 + 858 = 322608
Step 377: 322608 + 858 = 323466
Step 378: 323466 + 858 = 324324
Step 379: 324324 + 858 = 325182
Step 380: 325182 + 858 = 326040
Step 381: 326040 + 858 = 326898
Step 382: 326898 + 858 = 327756
Step 383: 327756 + 858 = 328614
Step 384: 328614 + 858 = 329472
Step 385: 329472 + 858 = 330330
Step 386: 330330 + 858 = 331188
Step 387: 331188 + 858 = 332046
Step 388: 332046 + 858 = 332904
Step 389: 332904 + 858 = 333762
Step 390: 333762 + 858 = 334620
Step 391: 334620 + 858 = 335478
Step 392: 335478 + 858 = 336336
Step 393: 336336 + 858 = 337194
Step 394: 337194 + 858 = 338052
Step 395: 338052 + 858 = 338910
Step 396: 338910 + 858 = 339768
Step 397: 339768 + 858 = 340626
Step 398: 340626 + 858 = 341484
Step 399: 341484 + 858 = 342342
Step 400: 342342 + 858 = 343200
Step 401: 343200 + 858 = 344058
Step 402: 344058 + 858 = 344916
Step 403: 344916 + 858 = 345774
Step 404: 345774 + 858 = 346632
Step 405: 346632 + 858 = 347490
Step 406: 347490 + 858 = 348348
Step 407: 348348 + 858 = 349206
Step 408: 349206 + 858 = 350064
Step 409: 350064 + 858 = 350922
Step 410: 350922 + 858 = 351780
Step 411: 351780 + 858 = 352638
Step 412: 352638 + 858 = 353496
Step 413: 353496 + 858 = 354354
Step 414: 354354 + 858 = 355212
Step 415: 355212 + 858 = 356070
Step 416: 356070 + 858 = 356928
Step 417: 356928 + 858 = 357786
Step 418: 357786 + 858 = 358644
Step 419: 358644 + 858 = 359502
Step 420: 359502 + 858 = 360360
Step 421: 360360 + 858 = 361218

So, 858*421 = 361218