Alright, let's solve this math problem step by step. First, we have the number 397. 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 397 and add it to itself 420 times.
Step 1: 0 + 397 = 397
Step 2: 397 + 397 = 794
Step 3: 794 + 397 = 1191
Step 4: 1191 + 397 = 1588
Step 5: 1588 + 397 = 1985
Step 6: 1985 + 397 = 2382
Step 7: 2382 + 397 = 2779
Step 8: 2779 + 397 = 3176
Step 9: 3176 + 397 = 3573
Step 10: 3573 + 397 = 3970
Step 11: 3970 + 397 = 4367
Step 12: 4367 + 397 = 4764
Step 13: 4764 + 397 = 5161
Step 14: 5161 + 397 = 5558
Step 15: 5558 + 397 = 5955
Step 16: 5955 + 397 = 6352
Step 17: 6352 + 397 = 6749
Step 18: 6749 + 397 = 7146
Step 19: 7146 + 397 = 7543
Step 20: 7543 + 397 = 7940
Step 21: 7940 + 397 = 8337
Step 22: 8337 + 397 = 8734
Step 23: 8734 + 397 = 9131
Step 24: 9131 + 397 = 9528
Step 25: 9528 + 397 = 9925
Step 26: 9925 + 397 = 10322
Step 27: 10322 + 397 = 10719
Step 28: 10719 + 397 = 11116
Step 29: 11116 + 397 = 11513
Step 30: 11513 + 397 = 11910
Step 31: 11910 + 397 = 12307
Step 32: 12307 + 397 = 12704
Step 33: 12704 + 397 = 13101
Step 34: 13101 + 397 = 13498
Step 35: 13498 + 397 = 13895
Step 36: 13895 + 397 = 14292
Step 37: 14292 + 397 = 14689
Step 38: 14689 + 397 = 15086
Step 39: 15086 + 397 = 15483
Step 40: 15483 + 397 = 15880
Step 41: 15880 + 397 = 16277
Step 42: 16277 + 397 = 16674
Step 43: 16674 + 397 = 17071
Step 44: 17071 + 397 = 17468
Step 45: 17468 + 397 = 17865
Step 46: 17865 + 397 = 18262
Step 47: 18262 + 397 = 18659
Step 48: 18659 + 397 = 19056
Step 49: 19056 + 397 = 19453
Step 50: 19453 + 397 = 19850
Step 51: 19850 + 397 = 20247
Step 52: 20247 + 397 = 20644
Step 53: 20644 + 397 = 21041
Step 54: 21041 + 397 = 21438
Step 55: 21438 + 397 = 21835
Step 56: 21835 + 397 = 22232
Step 57: 22232 + 397 = 22629
Step 58: 22629 + 397 = 23026
Step 59: 23026 + 397 = 23423
Step 60: 23423 + 397 = 23820
Step 61: 23820 + 397 = 24217
Step 62: 24217 + 397 = 24614
Step 63: 24614 + 397 = 25011
Step 64: 25011 + 397 = 25408
Step 65: 25408 + 397 = 25805
Step 66: 25805 + 397 = 26202
Step 67: 26202 + 397 = 26599
Step 68: 26599 + 397 = 26996
Step 69: 26996 + 397 = 27393
Step 70: 27393 + 397 = 27790
Step 71: 27790 + 397 = 28187
Step 72: 28187 + 397 = 28584
Step 73: 28584 + 397 = 28981
Step 74: 28981 + 397 = 29378
Step 75: 29378 + 397 = 29775
Step 76: 29775 + 397 = 30172
Step 77: 30172 + 397 = 30569
Step 78: 30569 + 397 = 30966
Step 79: 30966 + 397 = 31363
Step 80: 31363 + 397 = 31760
Step 81: 31760 + 397 = 32157
Step 82: 32157 + 397 = 32554
Step 83: 32554 + 397 = 32951
Step 84: 32951 + 397 = 33348
Step 85: 33348 + 397 = 33745
Step 86: 33745 + 397 = 34142
Step 87: 34142 + 397 = 34539
Step 88: 34539 + 397 = 34936
Step 89: 34936 + 397 = 35333
Step 90: 35333 + 397 = 35730
Step 91: 35730 + 397 = 36127
Step 92: 36127 + 397 = 36524
Step 93: 36524 + 397 = 36921
Step 94: 36921 + 397 = 37318
Step 95: 37318 + 397 = 37715
Step 96: 37715 + 397 = 38112
Step 97: 38112 + 397 = 38509
Step 98: 38509 + 397 = 38906
Step 99: 38906 + 397 = 39303
Step 100: 39303 + 397 = 39700
Step 101: 39700 + 397 = 40097
Step 102: 40097 + 397 = 40494
Step 103: 40494 + 397 = 40891
Step 104: 40891 + 397 = 41288
Step 105: 41288 + 397 = 41685
Step 106: 41685 + 397 = 42082
Step 107: 42082 + 397 = 42479
Step 108: 42479 + 397 = 42876
Step 109: 42876 + 397 = 43273
Step 110: 43273 + 397 = 43670
Step 111: 43670 + 397 = 44067
Step 112: 44067 + 397 = 44464
Step 113: 44464 + 397 = 44861
Step 114: 44861 + 397 = 45258
Step 115: 45258 + 397 = 45655
Step 116: 45655 + 397 = 46052
Step 117: 46052 + 397 = 46449
Step 118: 46449 + 397 = 46846
Step 119: 46846 + 397 = 47243
Step 120: 47243 + 397 = 47640
Step 121: 47640 + 397 = 48037
Step 122: 48037 + 397 = 48434
Step 123: 48434 + 397 = 48831
Step 124: 48831 + 397 = 49228
Step 125: 49228 + 397 = 49625
Step 126: 49625 + 397 = 50022
Step 127: 50022 + 397 = 50419
Step 128: 50419 + 397 = 50816
Step 129: 50816 + 397 = 51213
Step 130: 51213 + 397 = 51610
Step 131: 51610 + 397 = 52007
Step 132: 52007 + 397 = 52404
Step 133: 52404 + 397 = 52801
Step 134: 52801 + 397 = 53198
Step 135: 53198 + 397 = 53595
Step 136: 53595 + 397 = 53992
Step 137: 53992 + 397 = 54389
Step 138: 54389 + 397 = 54786
Step 139: 54786 + 397 = 55183
Step 140: 55183 + 397 = 55580
Step 141: 55580 + 397 = 55977
Step 142: 55977 + 397 = 56374
Step 143: 56374 + 397 = 56771
Step 144: 56771 + 397 = 57168
Step 145: 57168 + 397 = 57565
Step 146: 57565 + 397 = 57962
Step 147: 57962 + 397 = 58359
Step 148: 58359 + 397 = 58756
Step 149: 58756 + 397 = 59153
Step 150: 59153 + 397 = 59550
Step 151: 59550 + 397 = 59947
Step 152: 59947 + 397 = 60344
Step 153: 60344 + 397 = 60741
Step 154: 60741 + 397 = 61138
Step 155: 61138 + 397 = 61535
Step 156: 61535 + 397 = 61932
Step 157: 61932 + 397 = 62329
Step 158: 62329 + 397 = 62726
Step 159: 62726 + 397 = 63123
Step 160: 63123 + 397 = 63520
Step 161: 63520 + 397 = 63917
Step 162: 63917 + 397 = 64314
Step 163: 64314 + 397 = 64711
Step 164: 64711 + 397 = 65108
Step 165: 65108 + 397 = 65505
Step 166: 65505 + 397 = 65902
Step 167: 65902 + 397 = 66299
Step 168: 66299 + 397 = 66696
Step 169: 66696 + 397 = 67093
Step 170: 67093 + 397 = 67490
Step 171: 67490 + 397 = 67887
Step 172: 67887 + 397 = 68284
Step 173: 68284 + 397 = 68681
Step 174: 68681 + 397 = 69078
Step 175: 69078 + 397 = 69475
Step 176: 69475 + 397 = 69872
Step 177: 69872 + 397 = 70269
Step 178: 70269 + 397 = 70666
Step 179: 70666 + 397 = 71063
Step 180: 71063 + 397 = 71460
Step 181: 71460 + 397 = 71857
Step 182: 71857 + 397 = 72254
Step 183: 72254 + 397 = 72651
Step 184: 72651 + 397 = 73048
Step 185: 73048 + 397 = 73445
Step 186: 73445 + 397 = 73842
Step 187: 73842 + 397 = 74239
Step 188: 74239 + 397 = 74636
Step 189: 74636 + 397 = 75033
Step 190: 75033 + 397 = 75430
Step 191: 75430 + 397 = 75827
Step 192: 75827 + 397 = 76224
Step 193: 76224 + 397 = 76621
Step 194: 76621 + 397 = 77018
Step 195: 77018 + 397 = 77415
Step 196: 77415 + 397 = 77812
Step 197: 77812 + 397 = 78209
Step 198: 78209 + 397 = 78606
Step 199: 78606 + 397 = 79003
Step 200: 79003 + 397 = 79400
Step 201: 79400 + 397 = 79797
Step 202: 79797 + 397 = 80194
Step 203: 80194 + 397 = 80591
Step 204: 80591 + 397 = 80988
Step 205: 80988 + 397 = 81385
Step 206: 81385 + 397 = 81782
Step 207: 81782 + 397 = 82179
Step 208: 82179 + 397 = 82576
Step 209: 82576 + 397 = 82973
Step 210: 82973 + 397 = 83370
Step 211: 83370 + 397 = 83767
Step 212: 83767 + 397 = 84164
Step 213: 84164 + 397 = 84561
Step 214: 84561 + 397 = 84958
Step 215: 84958 + 397 = 85355
Step 216: 85355 + 397 = 85752
Step 217: 85752 + 397 = 86149
Step 218: 86149 + 397 = 86546
Step 219: 86546 + 397 = 86943
Step 220: 86943 + 397 = 87340
Step 221: 87340 + 397 = 87737
Step 222: 87737 + 397 = 88134
Step 223: 88134 + 397 = 88531
Step 224: 88531 + 397 = 88928
Step 225: 88928 + 397 = 89325
Step 226: 89325 + 397 = 89722
Step 227: 89722 + 397 = 90119
Step 228: 90119 + 397 = 90516
Step 229: 90516 + 397 = 90913
Step 230: 90913 + 397 = 91310
Step 231: 91310 + 397 = 91707
Step 232: 91707 + 397 = 92104
Step 233: 92104 + 397 = 92501
Step 234: 92501 + 397 = 92898
Step 235: 92898 + 397 = 93295
Step 236: 93295 + 397 = 93692
Step 237: 93692 + 397 = 94089
Step 238: 94089 + 397 = 94486
Step 239: 94486 + 397 = 94883
Step 240: 94883 + 397 = 95280
Step 241: 95280 + 397 = 95677
Step 242: 95677 + 397 = 96074
Step 243: 96074 + 397 = 96471
Step 244: 96471 + 397 = 96868
Step 245: 96868 + 397 = 97265
Step 246: 97265 + 397 = 97662
Step 247: 97662 + 397 = 98059
Step 248: 98059 + 397 = 98456
Step 249: 98456 + 397 = 98853
Step 250: 98853 + 397 = 99250
Step 251: 99250 + 397 = 99647
Step 252: 99647 + 397 = 100044
Step 253: 100044 + 397 = 100441
Step 254: 100441 + 397 = 100838
Step 255: 100838 + 397 = 101235
Step 256: 101235 + 397 = 101632
Step 257: 101632 + 397 = 102029
Step 258: 102029 + 397 = 102426
Step 259: 102426 + 397 = 102823
Step 260: 102823 + 397 = 103220
Step 261: 103220 + 397 = 103617
Step 262: 103617 + 397 = 104014
Step 263: 104014 + 397 = 104411
Step 264: 104411 + 397 = 104808
Step 265: 104808 + 397 = 105205
Step 266: 105205 + 397 = 105602
Step 267: 105602 + 397 = 105999
Step 268: 105999 + 397 = 106396
Step 269: 106396 + 397 = 106793
Step 270: 106793 + 397 = 107190
Step 271: 107190 + 397 = 107587
Step 272: 107587 + 397 = 107984
Step 273: 107984 + 397 = 108381
Step 274: 108381 + 397 = 108778
Step 275: 108778 + 397 = 109175
Step 276: 109175 + 397 = 109572
Step 277: 109572 + 397 = 109969
Step 278: 109969 + 397 = 110366
Step 279: 110366 + 397 = 110763
Step 280: 110763 + 397 = 111160
Step 281: 111160 + 397 = 111557
Step 282: 111557 + 397 = 111954
Step 283: 111954 + 397 = 112351
Step 284: 112351 + 397 = 112748
Step 285: 112748 + 397 = 113145
Step 286: 113145 + 397 = 113542
Step 287: 113542 + 397 = 113939
Step 288: 113939 + 397 = 114336
Step 289: 114336 + 397 = 114733
Step 290: 114733 + 397 = 115130
Step 291: 115130 + 397 = 115527
Step 292: 115527 + 397 = 115924
Step 293: 115924 + 397 = 116321
Step 294: 116321 + 397 = 116718
Step 295: 116718 + 397 = 117115
Step 296: 117115 + 397 = 117512
Step 297: 117512 + 397 = 117909
Step 298: 117909 + 397 = 118306
Step 299: 118306 + 397 = 118703
Step 300: 118703 + 397 = 119100
Step 301: 119100 + 397 = 119497
Step 302: 119497 + 397 = 119894
Step 303: 119894 + 397 = 120291
Step 304: 120291 + 397 = 120688
Step 305: 120688 + 397 = 121085
Step 306: 121085 + 397 = 121482
Step 307: 121482 + 397 = 121879
Step 308: 121879 + 397 = 122276
Step 309: 122276 + 397 = 122673
Step 310: 122673 + 397 = 123070
Step 311: 123070 + 397 = 123467
Step 312: 123467 + 397 = 123864
Step 313: 123864 + 397 = 124261
Step 314: 124261 + 397 = 124658
Step 315: 124658 + 397 = 125055
Step 316: 125055 + 397 = 125452
Step 317: 125452 + 397 = 125849
Step 318: 125849 + 397 = 126246
Step 319: 126246 + 397 = 126643
Step 320: 126643 + 397 = 127040
Step 321: 127040 + 397 = 127437
Step 322: 127437 + 397 = 127834
Step 323: 127834 + 397 = 128231
Step 324: 128231 + 397 = 128628
Step 325: 128628 + 397 = 129025
Step 326: 129025 + 397 = 129422
Step 327: 129422 + 397 = 129819
Step 328: 129819 + 397 = 130216
Step 329: 130216 + 397 = 130613
Step 330: 130613 + 397 = 131010
Step 331: 131010 + 397 = 131407
Step 332: 131407 + 397 = 131804
Step 333: 131804 + 397 = 132201
Step 334: 132201 + 397 = 132598
Step 335: 132598 + 397 = 132995
Step 336: 132995 + 397 = 133392
Step 337: 133392 + 397 = 133789
Step 338: 133789 + 397 = 134186
Step 339: 134186 + 397 = 134583
Step 340: 134583 + 397 = 134980
Step 341: 134980 + 397 = 135377
Step 342: 135377 + 397 = 135774
Step 343: 135774 + 397 = 136171
Step 344: 136171 + 397 = 136568
Step 345: 136568 + 397 = 136965
Step 346: 136965 + 397 = 137362
Step 347: 137362 + 397 = 137759
Step 348: 137759 + 397 = 138156
Step 349: 138156 + 397 = 138553
Step 350: 138553 + 397 = 138950
Step 351: 138950 + 397 = 139347
Step 352: 139347 + 397 = 139744
Step 353: 139744 + 397 = 140141
Step 354: 140141 + 397 = 140538
Step 355: 140538 + 397 = 140935
Step 356: 140935 + 397 = 141332
Step 357: 141332 + 397 = 141729
Step 358: 141729 + 397 = 142126
Step 359: 142126 + 397 = 142523
Step 360: 142523 + 397 = 142920
Step 361: 142920 + 397 = 143317
Step 362: 143317 + 397 = 143714
Step 363: 143714 + 397 = 144111
Step 364: 144111 + 397 = 144508
Step 365: 144508 + 397 = 144905
Step 366: 144905 + 397 = 145302
Step 367: 145302 + 397 = 145699
Step 368: 145699 + 397 = 146096
Step 369: 146096 + 397 = 146493
Step 370: 146493 + 397 = 146890
Step 371: 146890 + 397 = 147287
Step 372: 147287 + 397 = 147684
Step 373: 147684 + 397 = 148081
Step 374: 148081 + 397 = 148478
Step 375: 148478 + 397 = 148875
Step 376: 148875 + 397 = 149272
Step 377: 149272 + 397 = 149669
Step 378: 149669 + 397 = 150066
Step 379: 150066 + 397 = 150463
Step 380: 150463 + 397 = 150860
Step 381: 150860 + 397 = 151257
Step 382: 151257 + 397 = 151654
Step 383: 151654 + 397 = 152051
Step 384: 152051 + 397 = 152448
Step 385: 152448 + 397 = 152845
Step 386: 152845 + 397 = 153242
Step 387: 153242 + 397 = 153639
Step 388: 153639 + 397 = 154036
Step 389: 154036 + 397 = 154433
Step 390: 154433 + 397 = 154830
Step 391: 154830 + 397 = 155227
Step 392: 155227 + 397 = 155624
Step 393: 155624 + 397 = 156021
Step 394: 156021 + 397 = 156418
Step 395: 156418 + 397 = 156815
Step 396: 156815 + 397 = 157212
Step 397: 157212 + 397 = 157609
Step 398: 157609 + 397 = 158006
Step 399: 158006 + 397 = 158403
Step 400: 158403 + 397 = 158800
Step 401: 158800 + 397 = 159197
Step 402: 159197 + 397 = 159594
Step 403: 159594 + 397 = 159991
Step 404: 159991 + 397 = 160388
Step 405: 160388 + 397 = 160785
Step 406: 160785 + 397 = 161182
Step 407: 161182 + 397 = 161579
Step 408: 161579 + 397 = 161976
Step 409: 161976 + 397 = 162373
Step 410: 162373 + 397 = 162770
Step 411: 162770 + 397 = 163167
Step 412: 163167 + 397 = 163564
Step 413: 163564 + 397 = 163961
Step 414: 163961 + 397 = 164358
Step 415: 164358 + 397 = 164755
Step 416: 164755 + 397 = 165152
Step 417: 165152 + 397 = 165549
Step 418: 165549 + 397 = 165946
Step 419: 165946 + 397 = 166343
Step 420: 166343 + 397 = 166740

So, 397*420 = 166740