Let's get this math done. We have 891 and we're going to multiply it by 388. This is the same as taking 891 and adding it to itself 388 times.
Step 1: 0 + 891 = 891
Step 2: 891 + 891 = 1782
Step 3: 1782 + 891 = 2673
Step 4: 2673 + 891 = 3564
Step 5: 3564 + 891 = 4455
Step 6: 4455 + 891 = 5346
Step 7: 5346 + 891 = 6237
Step 8: 6237 + 891 = 7128
Step 9: 7128 + 891 = 8019
Step 10: 8019 + 891 = 8910
Step 11: 8910 + 891 = 9801
Step 12: 9801 + 891 = 10692
Step 13: 10692 + 891 = 11583
Step 14: 11583 + 891 = 12474
Step 15: 12474 + 891 = 13365
Step 16: 13365 + 891 = 14256
Step 17: 14256 + 891 = 15147
Step 18: 15147 + 891 = 16038
Step 19: 16038 + 891 = 16929
Step 20: 16929 + 891 = 17820
Step 21: 17820 + 891 = 18711
Step 22: 18711 + 891 = 19602
Step 23: 19602 + 891 = 20493
Step 24: 20493 + 891 = 21384
Step 25: 21384 + 891 = 22275
Step 26: 22275 + 891 = 23166
Step 27: 23166 + 891 = 24057
Step 28: 24057 + 891 = 24948
Step 29: 24948 + 891 = 25839
Step 30: 25839 + 891 = 26730
Step 31: 26730 + 891 = 27621
Step 32: 27621 + 891 = 28512
Step 33: 28512 + 891 = 29403
Step 34: 29403 + 891 = 30294
Step 35: 30294 + 891 = 31185
Step 36: 31185 + 891 = 32076
Step 37: 32076 + 891 = 32967
Step 38: 32967 + 891 = 33858
Step 39: 33858 + 891 = 34749
Step 40: 34749 + 891 = 35640
Step 41: 35640 + 891 = 36531
Step 42: 36531 + 891 = 37422
Step 43: 37422 + 891 = 38313
Step 44: 38313 + 891 = 39204
Step 45: 39204 + 891 = 40095
Step 46: 40095 + 891 = 40986
Step 47: 40986 + 891 = 41877
Step 48: 41877 + 891 = 42768
Step 49: 42768 + 891 = 43659
Step 50: 43659 + 891 = 44550
Step 51: 44550 + 891 = 45441
Step 52: 45441 + 891 = 46332
Step 53: 46332 + 891 = 47223
Step 54: 47223 + 891 = 48114
Step 55: 48114 + 891 = 49005
Step 56: 49005 + 891 = 49896
Step 57: 49896 + 891 = 50787
Step 58: 50787 + 891 = 51678
Step 59: 51678 + 891 = 52569
Step 60: 52569 + 891 = 53460
Step 61: 53460 + 891 = 54351
Step 62: 54351 + 891 = 55242
Step 63: 55242 + 891 = 56133
Step 64: 56133 + 891 = 57024
Step 65: 57024 + 891 = 57915
Step 66: 57915 + 891 = 58806
Step 67: 58806 + 891 = 59697
Step 68: 59697 + 891 = 60588
Step 69: 60588 + 891 = 61479
Step 70: 61479 + 891 = 62370
Step 71: 62370 + 891 = 63261
Step 72: 63261 + 891 = 64152
Step 73: 64152 + 891 = 65043
Step 74: 65043 + 891 = 65934
Step 75: 65934 + 891 = 66825
Step 76: 66825 + 891 = 67716
Step 77: 67716 + 891 = 68607
Step 78: 68607 + 891 = 69498
Step 79: 69498 + 891 = 70389
Step 80: 70389 + 891 = 71280
Step 81: 71280 + 891 = 72171
Step 82: 72171 + 891 = 73062
Step 83: 73062 + 891 = 73953
Step 84: 73953 + 891 = 74844
Step 85: 74844 + 891 = 75735
Step 86: 75735 + 891 = 76626
Step 87: 76626 + 891 = 77517
Step 88: 77517 + 891 = 78408
Step 89: 78408 + 891 = 79299
Step 90: 79299 + 891 = 80190
Step 91: 80190 + 891 = 81081
Step 92: 81081 + 891 = 81972
Step 93: 81972 + 891 = 82863
Step 94: 82863 + 891 = 83754
Step 95: 83754 + 891 = 84645
Step 96: 84645 + 891 = 85536
Step 97: 85536 + 891 = 86427
Step 98: 86427 + 891 = 87318
Step 99: 87318 + 891 = 88209
Step 100: 88209 + 891 = 89100
Step 101: 89100 + 891 = 89991
Step 102: 89991 + 891 = 90882
Step 103: 90882 + 891 = 91773
Step 104: 91773 + 891 = 92664
Step 105: 92664 + 891 = 93555
Step 106: 93555 + 891 = 94446
Step 107: 94446 + 891 = 95337
Step 108: 95337 + 891 = 96228
Step 109: 96228 + 891 = 97119
Step 110: 97119 + 891 = 98010
Step 111: 98010 + 891 = 98901
Step 112: 98901 + 891 = 99792
Step 113: 99792 + 891 = 100683
Step 114: 100683 + 891 = 101574
Step 115: 101574 + 891 = 102465
Step 116: 102465 + 891 = 103356
Step 117: 103356 + 891 = 104247
Step 118: 104247 + 891 = 105138
Step 119: 105138 + 891 = 106029
Step 120: 106029 + 891 = 106920
Step 121: 106920 + 891 = 107811
Step 122: 107811 + 891 = 108702
Step 123: 108702 + 891 = 109593
Step 124: 109593 + 891 = 110484
Step 125: 110484 + 891 = 111375
Step 126: 111375 + 891 = 112266
Step 127: 112266 + 891 = 113157
Step 128: 113157 + 891 = 114048
Step 129: 114048 + 891 = 114939
Step 130: 114939 + 891 = 115830
Step 131: 115830 + 891 = 116721
Step 132: 116721 + 891 = 117612
Step 133: 117612 + 891 = 118503
Step 134: 118503 + 891 = 119394
Step 135: 119394 + 891 = 120285
Step 136: 120285 + 891 = 121176
Step 137: 121176 + 891 = 122067
Step 138: 122067 + 891 = 122958
Step 139: 122958 + 891 = 123849
Step 140: 123849 + 891 = 124740
Step 141: 124740 + 891 = 125631
Step 142: 125631 + 891 = 126522
Step 143: 126522 + 891 = 127413
Step 144: 127413 + 891 = 128304
Step 145: 128304 + 891 = 129195
Step 146: 129195 + 891 = 130086
Step 147: 130086 + 891 = 130977
Step 148: 130977 + 891 = 131868
Step 149: 131868 + 891 = 132759
Step 150: 132759 + 891 = 133650
Step 151: 133650 + 891 = 134541
Step 152: 134541 + 891 = 135432
Step 153: 135432 + 891 = 136323
Step 154: 136323 + 891 = 137214
Step 155: 137214 + 891 = 138105
Step 156: 138105 + 891 = 138996
Step 157: 138996 + 891 = 139887
Step 158: 139887 + 891 = 140778
Step 159: 140778 + 891 = 141669
Step 160: 141669 + 891 = 142560
Step 161: 142560 + 891 = 143451
Step 162: 143451 + 891 = 144342
Step 163: 144342 + 891 = 145233
Step 164: 145233 + 891 = 146124
Step 165: 146124 + 891 = 147015
Step 166: 147015 + 891 = 147906
Step 167: 147906 + 891 = 148797
Step 168: 148797 + 891 = 149688
Step 169: 149688 + 891 = 150579
Step 170: 150579 + 891 = 151470
Step 171: 151470 + 891 = 152361
Step 172: 152361 + 891 = 153252
Step 173: 153252 + 891 = 154143
Step 174: 154143 + 891 = 155034
Step 175: 155034 + 891 = 155925
Step 176: 155925 + 891 = 156816
Step 177: 156816 + 891 = 157707
Step 178: 157707 + 891 = 158598
Step 179: 158598 + 891 = 159489
Step 180: 159489 + 891 = 160380
Step 181: 160380 + 891 = 161271
Step 182: 161271 + 891 = 162162
Step 183: 162162 + 891 = 163053
Step 184: 163053 + 891 = 163944
Step 185: 163944 + 891 = 164835
Step 186: 164835 + 891 = 165726
Step 187: 165726 + 891 = 166617
Step 188: 166617 + 891 = 167508
Step 189: 167508 + 891 = 168399
Step 190: 168399 + 891 = 169290
Step 191: 169290 + 891 = 170181
Step 192: 170181 + 891 = 171072
Step 193: 171072 + 891 = 171963
Step 194: 171963 + 891 = 172854
Step 195: 172854 + 891 = 173745
Step 196: 173745 + 891 = 174636
Step 197: 174636 + 891 = 175527
Step 198: 175527 + 891 = 176418
Step 199: 176418 + 891 = 177309
Step 200: 177309 + 891 = 178200
Step 201: 178200 + 891 = 179091
Step 202: 179091 + 891 = 179982
Step 203: 179982 + 891 = 180873
Step 204: 180873 + 891 = 181764
Step 205: 181764 + 891 = 182655
Step 206: 182655 + 891 = 183546
Step 207: 183546 + 891 = 184437
Step 208: 184437 + 891 = 185328
Step 209: 185328 + 891 = 186219
Step 210: 186219 + 891 = 187110
Step 211: 187110 + 891 = 188001
Step 212: 188001 + 891 = 188892
Step 213: 188892 + 891 = 189783
Step 214: 189783 + 891 = 190674
Step 215: 190674 + 891 = 191565
Step 216: 191565 + 891 = 192456
Step 217: 192456 + 891 = 193347
Step 218: 193347 + 891 = 194238
Step 219: 194238 + 891 = 195129
Step 220: 195129 + 891 = 196020
Step 221: 196020 + 891 = 196911
Step 222: 196911 + 891 = 197802
Step 223: 197802 + 891 = 198693
Step 224: 198693 + 891 = 199584
Step 225: 199584 + 891 = 200475
Step 226: 200475 + 891 = 201366
Step 227: 201366 + 891 = 202257
Step 228: 202257 + 891 = 203148
Step 229: 203148 + 891 = 204039
Step 230: 204039 + 891 = 204930
Step 231: 204930 + 891 = 205821
Step 232: 205821 + 891 = 206712
Step 233: 206712 + 891 = 207603
Step 234: 207603 + 891 = 208494
Step 235: 208494 + 891 = 209385
Step 236: 209385 + 891 = 210276
Step 237: 210276 + 891 = 211167
Step 238: 211167 + 891 = 212058
Step 239: 212058 + 891 = 212949
Step 240: 212949 + 891 = 213840
Step 241: 213840 + 891 = 214731
Step 242: 214731 + 891 = 215622
Step 243: 215622 + 891 = 216513
Step 244: 216513 + 891 = 217404
Step 245: 217404 + 891 = 218295
Step 246: 218295 + 891 = 219186
Step 247: 219186 + 891 = 220077
Step 248: 220077 + 891 = 220968
Step 249: 220968 + 891 = 221859
Step 250: 221859 + 891 = 222750
Step 251: 222750 + 891 = 223641
Step 252: 223641 + 891 = 224532
Step 253: 224532 + 891 = 225423
Step 254: 225423 + 891 = 226314
Step 255: 226314 + 891 = 227205
Step 256: 227205 + 891 = 228096
Step 257: 228096 + 891 = 228987
Step 258: 228987 + 891 = 229878
Step 259: 229878 + 891 = 230769
Step 260: 230769 + 891 = 231660
Step 261: 231660 + 891 = 232551
Step 262: 232551 + 891 = 233442
Step 263: 233442 + 891 = 234333
Step 264: 234333 + 891 = 235224
Step 265: 235224 + 891 = 236115
Step 266: 236115 + 891 = 237006
Step 267: 237006 + 891 = 237897
Step 268: 237897 + 891 = 238788
Step 269: 238788 + 891 = 239679
Step 270: 239679 + 891 = 240570
Step 271: 240570 + 891 = 241461
Step 272: 241461 + 891 = 242352
Step 273: 242352 + 891 = 243243
Step 274: 243243 + 891 = 244134
Step 275: 244134 + 891 = 245025
Step 276: 245025 + 891 = 245916
Step 277: 245916 + 891 = 246807
Step 278: 246807 + 891 = 247698
Step 279: 247698 + 891 = 248589
Step 280: 248589 + 891 = 249480
Step 281: 249480 + 891 = 250371
Step 282: 250371 + 891 = 251262
Step 283: 251262 + 891 = 252153
Step 284: 252153 + 891 = 253044
Step 285: 253044 + 891 = 253935
Step 286: 253935 + 891 = 254826
Step 287: 254826 + 891 = 255717
Step 288: 255717 + 891 = 256608
Step 289: 256608 + 891 = 257499
Step 290: 257499 + 891 = 258390
Step 291: 258390 + 891 = 259281
Step 292: 259281 + 891 = 260172
Step 293: 260172 + 891 = 261063
Step 294: 261063 + 891 = 261954
Step 295: 261954 + 891 = 262845
Step 296: 262845 + 891 = 263736
Step 297: 263736 + 891 = 264627
Step 298: 264627 + 891 = 265518
Step 299: 265518 + 891 = 266409
Step 300: 266409 + 891 = 267300
Step 301: 267300 + 891 = 268191
Step 302: 268191 + 891 = 269082
Step 303: 269082 + 891 = 269973
Step 304: 269973 + 891 = 270864
Step 305: 270864 + 891 = 271755
Step 306: 271755 + 891 = 272646
Step 307: 272646 + 891 = 273537
Step 308: 273537 + 891 = 274428
Step 309: 274428 + 891 = 275319
Step 310: 275319 + 891 = 276210
Step 311: 276210 + 891 = 277101
Step 312: 277101 + 891 = 277992
Step 313: 277992 + 891 = 278883
Step 314: 278883 + 891 = 279774
Step 315: 279774 + 891 = 280665
Step 316: 280665 + 891 = 281556
Step 317: 281556 + 891 = 282447
Step 318: 282447 + 891 = 283338
Step 319: 283338 + 891 = 284229
Step 320: 284229 + 891 = 285120
Step 321: 285120 + 891 = 286011
Step 322: 286011 + 891 = 286902
Step 323: 286902 + 891 = 287793
Step 324: 287793 + 891 = 288684
Step 325: 288684 + 891 = 289575
Step 326: 289575 + 891 = 290466
Step 327: 290466 + 891 = 291357
Step 328: 291357 + 891 = 292248
Step 329: 292248 + 891 = 293139
Step 330: 293139 + 891 = 294030
Step 331: 294030 + 891 = 294921
Step 332: 294921 + 891 = 295812
Step 333: 295812 + 891 = 296703
Step 334: 296703 + 891 = 297594
Step 335: 297594 + 891 = 298485
Step 336: 298485 + 891 = 299376
Step 337: 299376 + 891 = 300267
Step 338: 300267 + 891 = 301158
Step 339: 301158 + 891 = 302049
Step 340: 302049 + 891 = 302940
Step 341: 302940 + 891 = 303831
Step 342: 303831 + 891 = 304722
Step 343: 304722 + 891 = 305613
Step 344: 305613 + 891 = 306504
Step 345: 306504 + 891 = 307395
Step 346: 307395 + 891 = 308286
Step 347: 308286 + 891 = 309177
Step 348: 309177 + 891 = 310068
Step 349: 310068 + 891 = 310959
Step 350: 310959 + 891 = 311850
Step 351: 311850 + 891 = 312741
Step 352: 312741 + 891 = 313632
Step 353: 313632 + 891 = 314523
Step 354: 314523 + 891 = 315414
Step 355: 315414 + 891 = 316305
Step 356: 316305 + 891 = 317196
Step 357: 317196 + 891 = 318087
Step 358: 318087 + 891 = 318978
Step 359: 318978 + 891 = 319869
Step 360: 319869 + 891 = 320760
Step 361: 320760 + 891 = 321651
Step 362: 321651 + 891 = 322542
Step 363: 322542 + 891 = 323433
Step 364: 323433 + 891 = 324324
Step 365: 324324 + 891 = 325215
Step 366: 325215 + 891 = 326106
Step 367: 326106 + 891 = 326997
Step 368: 326997 + 891 = 327888
Step 369: 327888 + 891 = 328779
Step 370: 328779 + 891 = 329670
Step 371: 329670 + 891 = 330561
Step 372: 330561 + 891 = 331452
Step 373: 331452 + 891 = 332343
Step 374: 332343 + 891 = 333234
Step 375: 333234 + 891 = 334125
Step 376: 334125 + 891 = 335016
Step 377: 335016 + 891 = 335907
Step 378: 335907 + 891 = 336798
Step 379: 336798 + 891 = 337689
Step 380: 337689 + 891 = 338580
Step 381: 338580 + 891 = 339471
Step 382: 339471 + 891 = 340362
Step 383: 340362 + 891 = 341253
Step 384: 341253 + 891 = 342144
Step 385: 342144 + 891 = 343035
Step 386: 343035 + 891 = 343926
Step 387: 343926 + 891 = 344817
Step 388: 344817 + 891 = 345708

So, 891*388 = 345708