OK, let's crack this. We're given 963 and our task is to multiply it by 421. Essentially, we'll be adding 963 to itself 421 times.
Step 1: 0 + 963 = 963
Step 2: 963 + 963 = 1926
Step 3: 1926 + 963 = 2889
Step 4: 2889 + 963 = 3852
Step 5: 3852 + 963 = 4815
Step 6: 4815 + 963 = 5778
Step 7: 5778 + 963 = 6741
Step 8: 6741 + 963 = 7704
Step 9: 7704 + 963 = 8667
Step 10: 8667 + 963 = 9630
Step 11: 9630 + 963 = 10593
Step 12: 10593 + 963 = 11556
Step 13: 11556 + 963 = 12519
Step 14: 12519 + 963 = 13482
Step 15: 13482 + 963 = 14445
Step 16: 14445 + 963 = 15408
Step 17: 15408 + 963 = 16371
Step 18: 16371 + 963 = 17334
Step 19: 17334 + 963 = 18297
Step 20: 18297 + 963 = 19260
Step 21: 19260 + 963 = 20223
Step 22: 20223 + 963 = 21186
Step 23: 21186 + 963 = 22149
Step 24: 22149 + 963 = 23112
Step 25: 23112 + 963 = 24075
Step 26: 24075 + 963 = 25038
Step 27: 25038 + 963 = 26001
Step 28: 26001 + 963 = 26964
Step 29: 26964 + 963 = 27927
Step 30: 27927 + 963 = 28890
Step 31: 28890 + 963 = 29853
Step 32: 29853 + 963 = 30816
Step 33: 30816 + 963 = 31779
Step 34: 31779 + 963 = 32742
Step 35: 32742 + 963 = 33705
Step 36: 33705 + 963 = 34668
Step 37: 34668 + 963 = 35631
Step 38: 35631 + 963 = 36594
Step 39: 36594 + 963 = 37557
Step 40: 37557 + 963 = 38520
Step 41: 38520 + 963 = 39483
Step 42: 39483 + 963 = 40446
Step 43: 40446 + 963 = 41409
Step 44: 41409 + 963 = 42372
Step 45: 42372 + 963 = 43335
Step 46: 43335 + 963 = 44298
Step 47: 44298 + 963 = 45261
Step 48: 45261 + 963 = 46224
Step 49: 46224 + 963 = 47187
Step 50: 47187 + 963 = 48150
Step 51: 48150 + 963 = 49113
Step 52: 49113 + 963 = 50076
Step 53: 50076 + 963 = 51039
Step 54: 51039 + 963 = 52002
Step 55: 52002 + 963 = 52965
Step 56: 52965 + 963 = 53928
Step 57: 53928 + 963 = 54891
Step 58: 54891 + 963 = 55854
Step 59: 55854 + 963 = 56817
Step 60: 56817 + 963 = 57780
Step 61: 57780 + 963 = 58743
Step 62: 58743 + 963 = 59706
Step 63: 59706 + 963 = 60669
Step 64: 60669 + 963 = 61632
Step 65: 61632 + 963 = 62595
Step 66: 62595 + 963 = 63558
Step 67: 63558 + 963 = 64521
Step 68: 64521 + 963 = 65484
Step 69: 65484 + 963 = 66447
Step 70: 66447 + 963 = 67410
Step 71: 67410 + 963 = 68373
Step 72: 68373 + 963 = 69336
Step 73: 69336 + 963 = 70299
Step 74: 70299 + 963 = 71262
Step 75: 71262 + 963 = 72225
Step 76: 72225 + 963 = 73188
Step 77: 73188 + 963 = 74151
Step 78: 74151 + 963 = 75114
Step 79: 75114 + 963 = 76077
Step 80: 76077 + 963 = 77040
Step 81: 77040 + 963 = 78003
Step 82: 78003 + 963 = 78966
Step 83: 78966 + 963 = 79929
Step 84: 79929 + 963 = 80892
Step 85: 80892 + 963 = 81855
Step 86: 81855 + 963 = 82818
Step 87: 82818 + 963 = 83781
Step 88: 83781 + 963 = 84744
Step 89: 84744 + 963 = 85707
Step 90: 85707 + 963 = 86670
Step 91: 86670 + 963 = 87633
Step 92: 87633 + 963 = 88596
Step 93: 88596 + 963 = 89559
Step 94: 89559 + 963 = 90522
Step 95: 90522 + 963 = 91485
Step 96: 91485 + 963 = 92448
Step 97: 92448 + 963 = 93411
Step 98: 93411 + 963 = 94374
Step 99: 94374 + 963 = 95337
Step 100: 95337 + 963 = 96300
Step 101: 96300 + 963 = 97263
Step 102: 97263 + 963 = 98226
Step 103: 98226 + 963 = 99189
Step 104: 99189 + 963 = 100152
Step 105: 100152 + 963 = 101115
Step 106: 101115 + 963 = 102078
Step 107: 102078 + 963 = 103041
Step 108: 103041 + 963 = 104004
Step 109: 104004 + 963 = 104967
Step 110: 104967 + 963 = 105930
Step 111: 105930 + 963 = 106893
Step 112: 106893 + 963 = 107856
Step 113: 107856 + 963 = 108819
Step 114: 108819 + 963 = 109782
Step 115: 109782 + 963 = 110745
Step 116: 110745 + 963 = 111708
Step 117: 111708 + 963 = 112671
Step 118: 112671 + 963 = 113634
Step 119: 113634 + 963 = 114597
Step 120: 114597 + 963 = 115560
Step 121: 115560 + 963 = 116523
Step 122: 116523 + 963 = 117486
Step 123: 117486 + 963 = 118449
Step 124: 118449 + 963 = 119412
Step 125: 119412 + 963 = 120375
Step 126: 120375 + 963 = 121338
Step 127: 121338 + 963 = 122301
Step 128: 122301 + 963 = 123264
Step 129: 123264 + 963 = 124227
Step 130: 124227 + 963 = 125190
Step 131: 125190 + 963 = 126153
Step 132: 126153 + 963 = 127116
Step 133: 127116 + 963 = 128079
Step 134: 128079 + 963 = 129042
Step 135: 129042 + 963 = 130005
Step 136: 130005 + 963 = 130968
Step 137: 130968 + 963 = 131931
Step 138: 131931 + 963 = 132894
Step 139: 132894 + 963 = 133857
Step 140: 133857 + 963 = 134820
Step 141: 134820 + 963 = 135783
Step 142: 135783 + 963 = 136746
Step 143: 136746 + 963 = 137709
Step 144: 137709 + 963 = 138672
Step 145: 138672 + 963 = 139635
Step 146: 139635 + 963 = 140598
Step 147: 140598 + 963 = 141561
Step 148: 141561 + 963 = 142524
Step 149: 142524 + 963 = 143487
Step 150: 143487 + 963 = 144450
Step 151: 144450 + 963 = 145413
Step 152: 145413 + 963 = 146376
Step 153: 146376 + 963 = 147339
Step 154: 147339 + 963 = 148302
Step 155: 148302 + 963 = 149265
Step 156: 149265 + 963 = 150228
Step 157: 150228 + 963 = 151191
Step 158: 151191 + 963 = 152154
Step 159: 152154 + 963 = 153117
Step 160: 153117 + 963 = 154080
Step 161: 154080 + 963 = 155043
Step 162: 155043 + 963 = 156006
Step 163: 156006 + 963 = 156969
Step 164: 156969 + 963 = 157932
Step 165: 157932 + 963 = 158895
Step 166: 158895 + 963 = 159858
Step 167: 159858 + 963 = 160821
Step 168: 160821 + 963 = 161784
Step 169: 161784 + 963 = 162747
Step 170: 162747 + 963 = 163710
Step 171: 163710 + 963 = 164673
Step 172: 164673 + 963 = 165636
Step 173: 165636 + 963 = 166599
Step 174: 166599 + 963 = 167562
Step 175: 167562 + 963 = 168525
Step 176: 168525 + 963 = 169488
Step 177: 169488 + 963 = 170451
Step 178: 170451 + 963 = 171414
Step 179: 171414 + 963 = 172377
Step 180: 172377 + 963 = 173340
Step 181: 173340 + 963 = 174303
Step 182: 174303 + 963 = 175266
Step 183: 175266 + 963 = 176229
Step 184: 176229 + 963 = 177192
Step 185: 177192 + 963 = 178155
Step 186: 178155 + 963 = 179118
Step 187: 179118 + 963 = 180081
Step 188: 180081 + 963 = 181044
Step 189: 181044 + 963 = 182007
Step 190: 182007 + 963 = 182970
Step 191: 182970 + 963 = 183933
Step 192: 183933 + 963 = 184896
Step 193: 184896 + 963 = 185859
Step 194: 185859 + 963 = 186822
Step 195: 186822 + 963 = 187785
Step 196: 187785 + 963 = 188748
Step 197: 188748 + 963 = 189711
Step 198: 189711 + 963 = 190674
Step 199: 190674 + 963 = 191637
Step 200: 191637 + 963 = 192600
Step 201: 192600 + 963 = 193563
Step 202: 193563 + 963 = 194526
Step 203: 194526 + 963 = 195489
Step 204: 195489 + 963 = 196452
Step 205: 196452 + 963 = 197415
Step 206: 197415 + 963 = 198378
Step 207: 198378 + 963 = 199341
Step 208: 199341 + 963 = 200304
Step 209: 200304 + 963 = 201267
Step 210: 201267 + 963 = 202230
Step 211: 202230 + 963 = 203193
Step 212: 203193 + 963 = 204156
Step 213: 204156 + 963 = 205119
Step 214: 205119 + 963 = 206082
Step 215: 206082 + 963 = 207045
Step 216: 207045 + 963 = 208008
Step 217: 208008 + 963 = 208971
Step 218: 208971 + 963 = 209934
Step 219: 209934 + 963 = 210897
Step 220: 210897 + 963 = 211860
Step 221: 211860 + 963 = 212823
Step 222: 212823 + 963 = 213786
Step 223: 213786 + 963 = 214749
Step 224: 214749 + 963 = 215712
Step 225: 215712 + 963 = 216675
Step 226: 216675 + 963 = 217638
Step 227: 217638 + 963 = 218601
Step 228: 218601 + 963 = 219564
Step 229: 219564 + 963 = 220527
Step 230: 220527 + 963 = 221490
Step 231: 221490 + 963 = 222453
Step 232: 222453 + 963 = 223416
Step 233: 223416 + 963 = 224379
Step 234: 224379 + 963 = 225342
Step 235: 225342 + 963 = 226305
Step 236: 226305 + 963 = 227268
Step 237: 227268 + 963 = 228231
Step 238: 228231 + 963 = 229194
Step 239: 229194 + 963 = 230157
Step 240: 230157 + 963 = 231120
Step 241: 231120 + 963 = 232083
Step 242: 232083 + 963 = 233046
Step 243: 233046 + 963 = 234009
Step 244: 234009 + 963 = 234972
Step 245: 234972 + 963 = 235935
Step 246: 235935 + 963 = 236898
Step 247: 236898 + 963 = 237861
Step 248: 237861 + 963 = 238824
Step 249: 238824 + 963 = 239787
Step 250: 239787 + 963 = 240750
Step 251: 240750 + 963 = 241713
Step 252: 241713 + 963 = 242676
Step 253: 242676 + 963 = 243639
Step 254: 243639 + 963 = 244602
Step 255: 244602 + 963 = 245565
Step 256: 245565 + 963 = 246528
Step 257: 246528 + 963 = 247491
Step 258: 247491 + 963 = 248454
Step 259: 248454 + 963 = 249417
Step 260: 249417 + 963 = 250380
Step 261: 250380 + 963 = 251343
Step 262: 251343 + 963 = 252306
Step 263: 252306 + 963 = 253269
Step 264: 253269 + 963 = 254232
Step 265: 254232 + 963 = 255195
Step 266: 255195 + 963 = 256158
Step 267: 256158 + 963 = 257121
Step 268: 257121 + 963 = 258084
Step 269: 258084 + 963 = 259047
Step 270: 259047 + 963 = 260010
Step 271: 260010 + 963 = 260973
Step 272: 260973 + 963 = 261936
Step 273: 261936 + 963 = 262899
Step 274: 262899 + 963 = 263862
Step 275: 263862 + 963 = 264825
Step 276: 264825 + 963 = 265788
Step 277: 265788 + 963 = 266751
Step 278: 266751 + 963 = 267714
Step 279: 267714 + 963 = 268677
Step 280: 268677 + 963 = 269640
Step 281: 269640 + 963 = 270603
Step 282: 270603 + 963 = 271566
Step 283: 271566 + 963 = 272529
Step 284: 272529 + 963 = 273492
Step 285: 273492 + 963 = 274455
Step 286: 274455 + 963 = 275418
Step 287: 275418 + 963 = 276381
Step 288: 276381 + 963 = 277344
Step 289: 277344 + 963 = 278307
Step 290: 278307 + 963 = 279270
Step 291: 279270 + 963 = 280233
Step 292: 280233 + 963 = 281196
Step 293: 281196 + 963 = 282159
Step 294: 282159 + 963 = 283122
Step 295: 283122 + 963 = 284085
Step 296: 284085 + 963 = 285048
Step 297: 285048 + 963 = 286011
Step 298: 286011 + 963 = 286974
Step 299: 286974 + 963 = 287937
Step 300: 287937 + 963 = 288900
Step 301: 288900 + 963 = 289863
Step 302: 289863 + 963 = 290826
Step 303: 290826 + 963 = 291789
Step 304: 291789 + 963 = 292752
Step 305: 292752 + 963 = 293715
Step 306: 293715 + 963 = 294678
Step 307: 294678 + 963 = 295641
Step 308: 295641 + 963 = 296604
Step 309: 296604 + 963 = 297567
Step 310: 297567 + 963 = 298530
Step 311: 298530 + 963 = 299493
Step 312: 299493 + 963 = 300456
Step 313: 300456 + 963 = 301419
Step 314: 301419 + 963 = 302382
Step 315: 302382 + 963 = 303345
Step 316: 303345 + 963 = 304308
Step 317: 304308 + 963 = 305271
Step 318: 305271 + 963 = 306234
Step 319: 306234 + 963 = 307197
Step 320: 307197 + 963 = 308160
Step 321: 308160 + 963 = 309123
Step 322: 309123 + 963 = 310086
Step 323: 310086 + 963 = 311049
Step 324: 311049 + 963 = 312012
Step 325: 312012 + 963 = 312975
Step 326: 312975 + 963 = 313938
Step 327: 313938 + 963 = 314901
Step 328: 314901 + 963 = 315864
Step 329: 315864 + 963 = 316827
Step 330: 316827 + 963 = 317790
Step 331: 317790 + 963 = 318753
Step 332: 318753 + 963 = 319716
Step 333: 319716 + 963 = 320679
Step 334: 320679 + 963 = 321642
Step 335: 321642 + 963 = 322605
Step 336: 322605 + 963 = 323568
Step 337: 323568 + 963 = 324531
Step 338: 324531 + 963 = 325494
Step 339: 325494 + 963 = 326457
Step 340: 326457 + 963 = 327420
Step 341: 327420 + 963 = 328383
Step 342: 328383 + 963 = 329346
Step 343: 329346 + 963 = 330309
Step 344: 330309 + 963 = 331272
Step 345: 331272 + 963 = 332235
Step 346: 332235 + 963 = 333198
Step 347: 333198 + 963 = 334161
Step 348: 334161 + 963 = 335124
Step 349: 335124 + 963 = 336087
Step 350: 336087 + 963 = 337050
Step 351: 337050 + 963 = 338013
Step 352: 338013 + 963 = 338976
Step 353: 338976 + 963 = 339939
Step 354: 339939 + 963 = 340902
Step 355: 340902 + 963 = 341865
Step 356: 341865 + 963 = 342828
Step 357: 342828 + 963 = 343791
Step 358: 343791 + 963 = 344754
Step 359: 344754 + 963 = 345717
Step 360: 345717 + 963 = 346680
Step 361: 346680 + 963 = 347643
Step 362: 347643 + 963 = 348606
Step 363: 348606 + 963 = 349569
Step 364: 349569 + 963 = 350532
Step 365: 350532 + 963 = 351495
Step 366: 351495 + 963 = 352458
Step 367: 352458 + 963 = 353421
Step 368: 353421 + 963 = 354384
Step 369: 354384 + 963 = 355347
Step 370: 355347 + 963 = 356310
Step 371: 356310 + 963 = 357273
Step 372: 357273 + 963 = 358236
Step 373: 358236 + 963 = 359199
Step 374: 359199 + 963 = 360162
Step 375: 360162 + 963 = 361125
Step 376: 361125 + 963 = 362088
Step 377: 362088 + 963 = 363051
Step 378: 363051 + 963 = 364014
Step 379: 364014 + 963 = 364977
Step 380: 364977 + 963 = 365940
Step 381: 365940 + 963 = 366903
Step 382: 366903 + 963 = 367866
Step 383: 367866 + 963 = 368829
Step 384: 368829 + 963 = 369792
Step 385: 369792 + 963 = 370755
Step 386: 370755 + 963 = 371718
Step 387: 371718 + 963 = 372681
Step 388: 372681 + 963 = 373644
Step 389: 373644 + 963 = 374607
Step 390: 374607 + 963 = 375570
Step 391: 375570 + 963 = 376533
Step 392: 376533 + 963 = 377496
Step 393: 377496 + 963 = 378459
Step 394: 378459 + 963 = 379422
Step 395: 379422 + 963 = 380385
Step 396: 380385 + 963 = 381348
Step 397: 381348 + 963 = 382311
Step 398: 382311 + 963 = 383274
Step 399: 383274 + 963 = 384237
Step 400: 384237 + 963 = 385200
Step 401: 385200 + 963 = 386163
Step 402: 386163 + 963 = 387126
Step 403: 387126 + 963 = 388089
Step 404: 388089 + 963 = 389052
Step 405: 389052 + 963 = 390015
Step 406: 390015 + 963 = 390978
Step 407: 390978 + 963 = 391941
Step 408: 391941 + 963 = 392904
Step 409: 392904 + 963 = 393867
Step 410: 393867 + 963 = 394830
Step 411: 394830 + 963 = 395793
Step 412: 395793 + 963 = 396756
Step 413: 396756 + 963 = 397719
Step 414: 397719 + 963 = 398682
Step 415: 398682 + 963 = 399645
Step 416: 399645 + 963 = 400608
Step 417: 400608 + 963 = 401571
Step 418: 401571 + 963 = 402534
Step 419: 402534 + 963 = 403497
Step 420: 403497 + 963 = 404460
Step 421: 404460 + 963 = 405423

So, 963*421 = 405423