Alright, let's solve this math problem step by step. First, we have the number 877. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 405. So, we're going to take the number 877 and add it to itself 405 times.
Step 1: 0 + 877 = 877
Step 2: 877 + 877 = 1754
Step 3: 1754 + 877 = 2631
Step 4: 2631 + 877 = 3508
Step 5: 3508 + 877 = 4385
Step 6: 4385 + 877 = 5262
Step 7: 5262 + 877 = 6139
Step 8: 6139 + 877 = 7016
Step 9: 7016 + 877 = 7893
Step 10: 7893 + 877 = 8770
Step 11: 8770 + 877 = 9647
Step 12: 9647 + 877 = 10524
Step 13: 10524 + 877 = 11401
Step 14: 11401 + 877 = 12278
Step 15: 12278 + 877 = 13155
Step 16: 13155 + 877 = 14032
Step 17: 14032 + 877 = 14909
Step 18: 14909 + 877 = 15786
Step 19: 15786 + 877 = 16663
Step 20: 16663 + 877 = 17540
Step 21: 17540 + 877 = 18417
Step 22: 18417 + 877 = 19294
Step 23: 19294 + 877 = 20171
Step 24: 20171 + 877 = 21048
Step 25: 21048 + 877 = 21925
Step 26: 21925 + 877 = 22802
Step 27: 22802 + 877 = 23679
Step 28: 23679 + 877 = 24556
Step 29: 24556 + 877 = 25433
Step 30: 25433 + 877 = 26310
Step 31: 26310 + 877 = 27187
Step 32: 27187 + 877 = 28064
Step 33: 28064 + 877 = 28941
Step 34: 28941 + 877 = 29818
Step 35: 29818 + 877 = 30695
Step 36: 30695 + 877 = 31572
Step 37: 31572 + 877 = 32449
Step 38: 32449 + 877 = 33326
Step 39: 33326 + 877 = 34203
Step 40: 34203 + 877 = 35080
Step 41: 35080 + 877 = 35957
Step 42: 35957 + 877 = 36834
Step 43: 36834 + 877 = 37711
Step 44: 37711 + 877 = 38588
Step 45: 38588 + 877 = 39465
Step 46: 39465 + 877 = 40342
Step 47: 40342 + 877 = 41219
Step 48: 41219 + 877 = 42096
Step 49: 42096 + 877 = 42973
Step 50: 42973 + 877 = 43850
Step 51: 43850 + 877 = 44727
Step 52: 44727 + 877 = 45604
Step 53: 45604 + 877 = 46481
Step 54: 46481 + 877 = 47358
Step 55: 47358 + 877 = 48235
Step 56: 48235 + 877 = 49112
Step 57: 49112 + 877 = 49989
Step 58: 49989 + 877 = 50866
Step 59: 50866 + 877 = 51743
Step 60: 51743 + 877 = 52620
Step 61: 52620 + 877 = 53497
Step 62: 53497 + 877 = 54374
Step 63: 54374 + 877 = 55251
Step 64: 55251 + 877 = 56128
Step 65: 56128 + 877 = 57005
Step 66: 57005 + 877 = 57882
Step 67: 57882 + 877 = 58759
Step 68: 58759 + 877 = 59636
Step 69: 59636 + 877 = 60513
Step 70: 60513 + 877 = 61390
Step 71: 61390 + 877 = 62267
Step 72: 62267 + 877 = 63144
Step 73: 63144 + 877 = 64021
Step 74: 64021 + 877 = 64898
Step 75: 64898 + 877 = 65775
Step 76: 65775 + 877 = 66652
Step 77: 66652 + 877 = 67529
Step 78: 67529 + 877 = 68406
Step 79: 68406 + 877 = 69283
Step 80: 69283 + 877 = 70160
Step 81: 70160 + 877 = 71037
Step 82: 71037 + 877 = 71914
Step 83: 71914 + 877 = 72791
Step 84: 72791 + 877 = 73668
Step 85: 73668 + 877 = 74545
Step 86: 74545 + 877 = 75422
Step 87: 75422 + 877 = 76299
Step 88: 76299 + 877 = 77176
Step 89: 77176 + 877 = 78053
Step 90: 78053 + 877 = 78930
Step 91: 78930 + 877 = 79807
Step 92: 79807 + 877 = 80684
Step 93: 80684 + 877 = 81561
Step 94: 81561 + 877 = 82438
Step 95: 82438 + 877 = 83315
Step 96: 83315 + 877 = 84192
Step 97: 84192 + 877 = 85069
Step 98: 85069 + 877 = 85946
Step 99: 85946 + 877 = 86823
Step 100: 86823 + 877 = 87700
Step 101: 87700 + 877 = 88577
Step 102: 88577 + 877 = 89454
Step 103: 89454 + 877 = 90331
Step 104: 90331 + 877 = 91208
Step 105: 91208 + 877 = 92085
Step 106: 92085 + 877 = 92962
Step 107: 92962 + 877 = 93839
Step 108: 93839 + 877 = 94716
Step 109: 94716 + 877 = 95593
Step 110: 95593 + 877 = 96470
Step 111: 96470 + 877 = 97347
Step 112: 97347 + 877 = 98224
Step 113: 98224 + 877 = 99101
Step 114: 99101 + 877 = 99978
Step 115: 99978 + 877 = 100855
Step 116: 100855 + 877 = 101732
Step 117: 101732 + 877 = 102609
Step 118: 102609 + 877 = 103486
Step 119: 103486 + 877 = 104363
Step 120: 104363 + 877 = 105240
Step 121: 105240 + 877 = 106117
Step 122: 106117 + 877 = 106994
Step 123: 106994 + 877 = 107871
Step 124: 107871 + 877 = 108748
Step 125: 108748 + 877 = 109625
Step 126: 109625 + 877 = 110502
Step 127: 110502 + 877 = 111379
Step 128: 111379 + 877 = 112256
Step 129: 112256 + 877 = 113133
Step 130: 113133 + 877 = 114010
Step 131: 114010 + 877 = 114887
Step 132: 114887 + 877 = 115764
Step 133: 115764 + 877 = 116641
Step 134: 116641 + 877 = 117518
Step 135: 117518 + 877 = 118395
Step 136: 118395 + 877 = 119272
Step 137: 119272 + 877 = 120149
Step 138: 120149 + 877 = 121026
Step 139: 121026 + 877 = 121903
Step 140: 121903 + 877 = 122780
Step 141: 122780 + 877 = 123657
Step 142: 123657 + 877 = 124534
Step 143: 124534 + 877 = 125411
Step 144: 125411 + 877 = 126288
Step 145: 126288 + 877 = 127165
Step 146: 127165 + 877 = 128042
Step 147: 128042 + 877 = 128919
Step 148: 128919 + 877 = 129796
Step 149: 129796 + 877 = 130673
Step 150: 130673 + 877 = 131550
Step 151: 131550 + 877 = 132427
Step 152: 132427 + 877 = 133304
Step 153: 133304 + 877 = 134181
Step 154: 134181 + 877 = 135058
Step 155: 135058 + 877 = 135935
Step 156: 135935 + 877 = 136812
Step 157: 136812 + 877 = 137689
Step 158: 137689 + 877 = 138566
Step 159: 138566 + 877 = 139443
Step 160: 139443 + 877 = 140320
Step 161: 140320 + 877 = 141197
Step 162: 141197 + 877 = 142074
Step 163: 142074 + 877 = 142951
Step 164: 142951 + 877 = 143828
Step 165: 143828 + 877 = 144705
Step 166: 144705 + 877 = 145582
Step 167: 145582 + 877 = 146459
Step 168: 146459 + 877 = 147336
Step 169: 147336 + 877 = 148213
Step 170: 148213 + 877 = 149090
Step 171: 149090 + 877 = 149967
Step 172: 149967 + 877 = 150844
Step 173: 150844 + 877 = 151721
Step 174: 151721 + 877 = 152598
Step 175: 152598 + 877 = 153475
Step 176: 153475 + 877 = 154352
Step 177: 154352 + 877 = 155229
Step 178: 155229 + 877 = 156106
Step 179: 156106 + 877 = 156983
Step 180: 156983 + 877 = 157860
Step 181: 157860 + 877 = 158737
Step 182: 158737 + 877 = 159614
Step 183: 159614 + 877 = 160491
Step 184: 160491 + 877 = 161368
Step 185: 161368 + 877 = 162245
Step 186: 162245 + 877 = 163122
Step 187: 163122 + 877 = 163999
Step 188: 163999 + 877 = 164876
Step 189: 164876 + 877 = 165753
Step 190: 165753 + 877 = 166630
Step 191: 166630 + 877 = 167507
Step 192: 167507 + 877 = 168384
Step 193: 168384 + 877 = 169261
Step 194: 169261 + 877 = 170138
Step 195: 170138 + 877 = 171015
Step 196: 171015 + 877 = 171892
Step 197: 171892 + 877 = 172769
Step 198: 172769 + 877 = 173646
Step 199: 173646 + 877 = 174523
Step 200: 174523 + 877 = 175400
Step 201: 175400 + 877 = 176277
Step 202: 176277 + 877 = 177154
Step 203: 177154 + 877 = 178031
Step 204: 178031 + 877 = 178908
Step 205: 178908 + 877 = 179785
Step 206: 179785 + 877 = 180662
Step 207: 180662 + 877 = 181539
Step 208: 181539 + 877 = 182416
Step 209: 182416 + 877 = 183293
Step 210: 183293 + 877 = 184170
Step 211: 184170 + 877 = 185047
Step 212: 185047 + 877 = 185924
Step 213: 185924 + 877 = 186801
Step 214: 186801 + 877 = 187678
Step 215: 187678 + 877 = 188555
Step 216: 188555 + 877 = 189432
Step 217: 189432 + 877 = 190309
Step 218: 190309 + 877 = 191186
Step 219: 191186 + 877 = 192063
Step 220: 192063 + 877 = 192940
Step 221: 192940 + 877 = 193817
Step 222: 193817 + 877 = 194694
Step 223: 194694 + 877 = 195571
Step 224: 195571 + 877 = 196448
Step 225: 196448 + 877 = 197325
Step 226: 197325 + 877 = 198202
Step 227: 198202 + 877 = 199079
Step 228: 199079 + 877 = 199956
Step 229: 199956 + 877 = 200833
Step 230: 200833 + 877 = 201710
Step 231: 201710 + 877 = 202587
Step 232: 202587 + 877 = 203464
Step 233: 203464 + 877 = 204341
Step 234: 204341 + 877 = 205218
Step 235: 205218 + 877 = 206095
Step 236: 206095 + 877 = 206972
Step 237: 206972 + 877 = 207849
Step 238: 207849 + 877 = 208726
Step 239: 208726 + 877 = 209603
Step 240: 209603 + 877 = 210480
Step 241: 210480 + 877 = 211357
Step 242: 211357 + 877 = 212234
Step 243: 212234 + 877 = 213111
Step 244: 213111 + 877 = 213988
Step 245: 213988 + 877 = 214865
Step 246: 214865 + 877 = 215742
Step 247: 215742 + 877 = 216619
Step 248: 216619 + 877 = 217496
Step 249: 217496 + 877 = 218373
Step 250: 218373 + 877 = 219250
Step 251: 219250 + 877 = 220127
Step 252: 220127 + 877 = 221004
Step 253: 221004 + 877 = 221881
Step 254: 221881 + 877 = 222758
Step 255: 222758 + 877 = 223635
Step 256: 223635 + 877 = 224512
Step 257: 224512 + 877 = 225389
Step 258: 225389 + 877 = 226266
Step 259: 226266 + 877 = 227143
Step 260: 227143 + 877 = 228020
Step 261: 228020 + 877 = 228897
Step 262: 228897 + 877 = 229774
Step 263: 229774 + 877 = 230651
Step 264: 230651 + 877 = 231528
Step 265: 231528 + 877 = 232405
Step 266: 232405 + 877 = 233282
Step 267: 233282 + 877 = 234159
Step 268: 234159 + 877 = 235036
Step 269: 235036 + 877 = 235913
Step 270: 235913 + 877 = 236790
Step 271: 236790 + 877 = 237667
Step 272: 237667 + 877 = 238544
Step 273: 238544 + 877 = 239421
Step 274: 239421 + 877 = 240298
Step 275: 240298 + 877 = 241175
Step 276: 241175 + 877 = 242052
Step 277: 242052 + 877 = 242929
Step 278: 242929 + 877 = 243806
Step 279: 243806 + 877 = 244683
Step 280: 244683 + 877 = 245560
Step 281: 245560 + 877 = 246437
Step 282: 246437 + 877 = 247314
Step 283: 247314 + 877 = 248191
Step 284: 248191 + 877 = 249068
Step 285: 249068 + 877 = 249945
Step 286: 249945 + 877 = 250822
Step 287: 250822 + 877 = 251699
Step 288: 251699 + 877 = 252576
Step 289: 252576 + 877 = 253453
Step 290: 253453 + 877 = 254330
Step 291: 254330 + 877 = 255207
Step 292: 255207 + 877 = 256084
Step 293: 256084 + 877 = 256961
Step 294: 256961 + 877 = 257838
Step 295: 257838 + 877 = 258715
Step 296: 258715 + 877 = 259592
Step 297: 259592 + 877 = 260469
Step 298: 260469 + 877 = 261346
Step 299: 261346 + 877 = 262223
Step 300: 262223 + 877 = 263100
Step 301: 263100 + 877 = 263977
Step 302: 263977 + 877 = 264854
Step 303: 264854 + 877 = 265731
Step 304: 265731 + 877 = 266608
Step 305: 266608 + 877 = 267485
Step 306: 267485 + 877 = 268362
Step 307: 268362 + 877 = 269239
Step 308: 269239 + 877 = 270116
Step 309: 270116 + 877 = 270993
Step 310: 270993 + 877 = 271870
Step 311: 271870 + 877 = 272747
Step 312: 272747 + 877 = 273624
Step 313: 273624 + 877 = 274501
Step 314: 274501 + 877 = 275378
Step 315: 275378 + 877 = 276255
Step 316: 276255 + 877 = 277132
Step 317: 277132 + 877 = 278009
Step 318: 278009 + 877 = 278886
Step 319: 278886 + 877 = 279763
Step 320: 279763 + 877 = 280640
Step 321: 280640 + 877 = 281517
Step 322: 281517 + 877 = 282394
Step 323: 282394 + 877 = 283271
Step 324: 283271 + 877 = 284148
Step 325: 284148 + 877 = 285025
Step 326: 285025 + 877 = 285902
Step 327: 285902 + 877 = 286779
Step 328: 286779 + 877 = 287656
Step 329: 287656 + 877 = 288533
Step 330: 288533 + 877 = 289410
Step 331: 289410 + 877 = 290287
Step 332: 290287 + 877 = 291164
Step 333: 291164 + 877 = 292041
Step 334: 292041 + 877 = 292918
Step 335: 292918 + 877 = 293795
Step 336: 293795 + 877 = 294672
Step 337: 294672 + 877 = 295549
Step 338: 295549 + 877 = 296426
Step 339: 296426 + 877 = 297303
Step 340: 297303 + 877 = 298180
Step 341: 298180 + 877 = 299057
Step 342: 299057 + 877 = 299934
Step 343: 299934 + 877 = 300811
Step 344: 300811 + 877 = 301688
Step 345: 301688 + 877 = 302565
Step 346: 302565 + 877 = 303442
Step 347: 303442 + 877 = 304319
Step 348: 304319 + 877 = 305196
Step 349: 305196 + 877 = 306073
Step 350: 306073 + 877 = 306950
Step 351: 306950 + 877 = 307827
Step 352: 307827 + 877 = 308704
Step 353: 308704 + 877 = 309581
Step 354: 309581 + 877 = 310458
Step 355: 310458 + 877 = 311335
Step 356: 311335 + 877 = 312212
Step 357: 312212 + 877 = 313089
Step 358: 313089 + 877 = 313966
Step 359: 313966 + 877 = 314843
Step 360: 314843 + 877 = 315720
Step 361: 315720 + 877 = 316597
Step 362: 316597 + 877 = 317474
Step 363: 317474 + 877 = 318351
Step 364: 318351 + 877 = 319228
Step 365: 319228 + 877 = 320105
Step 366: 320105 + 877 = 320982
Step 367: 320982 + 877 = 321859
Step 368: 321859 + 877 = 322736
Step 369: 322736 + 877 = 323613
Step 370: 323613 + 877 = 324490
Step 371: 324490 + 877 = 325367
Step 372: 325367 + 877 = 326244
Step 373: 326244 + 877 = 327121
Step 374: 327121 + 877 = 327998
Step 375: 327998 + 877 = 328875
Step 376: 328875 + 877 = 329752
Step 377: 329752 + 877 = 330629
Step 378: 330629 + 877 = 331506
Step 379: 331506 + 877 = 332383
Step 380: 332383 + 877 = 333260
Step 381: 333260 + 877 = 334137
Step 382: 334137 + 877 = 335014
Step 383: 335014 + 877 = 335891
Step 384: 335891 + 877 = 336768
Step 385: 336768 + 877 = 337645
Step 386: 337645 + 877 = 338522
Step 387: 338522 + 877 = 339399
Step 388: 339399 + 877 = 340276
Step 389: 340276 + 877 = 341153
Step 390: 341153 + 877 = 342030
Step 391: 342030 + 877 = 342907
Step 392: 342907 + 877 = 343784
Step 393: 343784 + 877 = 344661
Step 394: 344661 + 877 = 345538
Step 395: 345538 + 877 = 346415
Step 396: 346415 + 877 = 347292
Step 397: 347292 + 877 = 348169
Step 398: 348169 + 877 = 349046
Step 399: 349046 + 877 = 349923
Step 400: 349923 + 877 = 350800
Step 401: 350800 + 877 = 351677
Step 402: 351677 + 877 = 352554
Step 403: 352554 + 877 = 353431
Step 404: 353431 + 877 = 354308
Step 405: 354308 + 877 = 355185

So, 877*405 = 355185