Let's roll up our sleeves and solve this. We have 647 and we're going to multiply it by 392, essentially adding 647 to itself 392 times.
Step 1: 0 + 647 = 647
Step 2: 647 + 647 = 1294
Step 3: 1294 + 647 = 1941
Step 4: 1941 + 647 = 2588
Step 5: 2588 + 647 = 3235
Step 6: 3235 + 647 = 3882
Step 7: 3882 + 647 = 4529
Step 8: 4529 + 647 = 5176
Step 9: 5176 + 647 = 5823
Step 10: 5823 + 647 = 6470
Step 11: 6470 + 647 = 7117
Step 12: 7117 + 647 = 7764
Step 13: 7764 + 647 = 8411
Step 14: 8411 + 647 = 9058
Step 15: 9058 + 647 = 9705
Step 16: 9705 + 647 = 10352
Step 17: 10352 + 647 = 10999
Step 18: 10999 + 647 = 11646
Step 19: 11646 + 647 = 12293
Step 20: 12293 + 647 = 12940
Step 21: 12940 + 647 = 13587
Step 22: 13587 + 647 = 14234
Step 23: 14234 + 647 = 14881
Step 24: 14881 + 647 = 15528
Step 25: 15528 + 647 = 16175
Step 26: 16175 + 647 = 16822
Step 27: 16822 + 647 = 17469
Step 28: 17469 + 647 = 18116
Step 29: 18116 + 647 = 18763
Step 30: 18763 + 647 = 19410
Step 31: 19410 + 647 = 20057
Step 32: 20057 + 647 = 20704
Step 33: 20704 + 647 = 21351
Step 34: 21351 + 647 = 21998
Step 35: 21998 + 647 = 22645
Step 36: 22645 + 647 = 23292
Step 37: 23292 + 647 = 23939
Step 38: 23939 + 647 = 24586
Step 39: 24586 + 647 = 25233
Step 40: 25233 + 647 = 25880
Step 41: 25880 + 647 = 26527
Step 42: 26527 + 647 = 27174
Step 43: 27174 + 647 = 27821
Step 44: 27821 + 647 = 28468
Step 45: 28468 + 647 = 29115
Step 46: 29115 + 647 = 29762
Step 47: 29762 + 647 = 30409
Step 48: 30409 + 647 = 31056
Step 49: 31056 + 647 = 31703
Step 50: 31703 + 647 = 32350
Step 51: 32350 + 647 = 32997
Step 52: 32997 + 647 = 33644
Step 53: 33644 + 647 = 34291
Step 54: 34291 + 647 = 34938
Step 55: 34938 + 647 = 35585
Step 56: 35585 + 647 = 36232
Step 57: 36232 + 647 = 36879
Step 58: 36879 + 647 = 37526
Step 59: 37526 + 647 = 38173
Step 60: 38173 + 647 = 38820
Step 61: 38820 + 647 = 39467
Step 62: 39467 + 647 = 40114
Step 63: 40114 + 647 = 40761
Step 64: 40761 + 647 = 41408
Step 65: 41408 + 647 = 42055
Step 66: 42055 + 647 = 42702
Step 67: 42702 + 647 = 43349
Step 68: 43349 + 647 = 43996
Step 69: 43996 + 647 = 44643
Step 70: 44643 + 647 = 45290
Step 71: 45290 + 647 = 45937
Step 72: 45937 + 647 = 46584
Step 73: 46584 + 647 = 47231
Step 74: 47231 + 647 = 47878
Step 75: 47878 + 647 = 48525
Step 76: 48525 + 647 = 49172
Step 77: 49172 + 647 = 49819
Step 78: 49819 + 647 = 50466
Step 79: 50466 + 647 = 51113
Step 80: 51113 + 647 = 51760
Step 81: 51760 + 647 = 52407
Step 82: 52407 + 647 = 53054
Step 83: 53054 + 647 = 53701
Step 84: 53701 + 647 = 54348
Step 85: 54348 + 647 = 54995
Step 86: 54995 + 647 = 55642
Step 87: 55642 + 647 = 56289
Step 88: 56289 + 647 = 56936
Step 89: 56936 + 647 = 57583
Step 90: 57583 + 647 = 58230
Step 91: 58230 + 647 = 58877
Step 92: 58877 + 647 = 59524
Step 93: 59524 + 647 = 60171
Step 94: 60171 + 647 = 60818
Step 95: 60818 + 647 = 61465
Step 96: 61465 + 647 = 62112
Step 97: 62112 + 647 = 62759
Step 98: 62759 + 647 = 63406
Step 99: 63406 + 647 = 64053
Step 100: 64053 + 647 = 64700
Step 101: 64700 + 647 = 65347
Step 102: 65347 + 647 = 65994
Step 103: 65994 + 647 = 66641
Step 104: 66641 + 647 = 67288
Step 105: 67288 + 647 = 67935
Step 106: 67935 + 647 = 68582
Step 107: 68582 + 647 = 69229
Step 108: 69229 + 647 = 69876
Step 109: 69876 + 647 = 70523
Step 110: 70523 + 647 = 71170
Step 111: 71170 + 647 = 71817
Step 112: 71817 + 647 = 72464
Step 113: 72464 + 647 = 73111
Step 114: 73111 + 647 = 73758
Step 115: 73758 + 647 = 74405
Step 116: 74405 + 647 = 75052
Step 117: 75052 + 647 = 75699
Step 118: 75699 + 647 = 76346
Step 119: 76346 + 647 = 76993
Step 120: 76993 + 647 = 77640
Step 121: 77640 + 647 = 78287
Step 122: 78287 + 647 = 78934
Step 123: 78934 + 647 = 79581
Step 124: 79581 + 647 = 80228
Step 125: 80228 + 647 = 80875
Step 126: 80875 + 647 = 81522
Step 127: 81522 + 647 = 82169
Step 128: 82169 + 647 = 82816
Step 129: 82816 + 647 = 83463
Step 130: 83463 + 647 = 84110
Step 131: 84110 + 647 = 84757
Step 132: 84757 + 647 = 85404
Step 133: 85404 + 647 = 86051
Step 134: 86051 + 647 = 86698
Step 135: 86698 + 647 = 87345
Step 136: 87345 + 647 = 87992
Step 137: 87992 + 647 = 88639
Step 138: 88639 + 647 = 89286
Step 139: 89286 + 647 = 89933
Step 140: 89933 + 647 = 90580
Step 141: 90580 + 647 = 91227
Step 142: 91227 + 647 = 91874
Step 143: 91874 + 647 = 92521
Step 144: 92521 + 647 = 93168
Step 145: 93168 + 647 = 93815
Step 146: 93815 + 647 = 94462
Step 147: 94462 + 647 = 95109
Step 148: 95109 + 647 = 95756
Step 149: 95756 + 647 = 96403
Step 150: 96403 + 647 = 97050
Step 151: 97050 + 647 = 97697
Step 152: 97697 + 647 = 98344
Step 153: 98344 + 647 = 98991
Step 154: 98991 + 647 = 99638
Step 155: 99638 + 647 = 100285
Step 156: 100285 + 647 = 100932
Step 157: 100932 + 647 = 101579
Step 158: 101579 + 647 = 102226
Step 159: 102226 + 647 = 102873
Step 160: 102873 + 647 = 103520
Step 161: 103520 + 647 = 104167
Step 162: 104167 + 647 = 104814
Step 163: 104814 + 647 = 105461
Step 164: 105461 + 647 = 106108
Step 165: 106108 + 647 = 106755
Step 166: 106755 + 647 = 107402
Step 167: 107402 + 647 = 108049
Step 168: 108049 + 647 = 108696
Step 169: 108696 + 647 = 109343
Step 170: 109343 + 647 = 109990
Step 171: 109990 + 647 = 110637
Step 172: 110637 + 647 = 111284
Step 173: 111284 + 647 = 111931
Step 174: 111931 + 647 = 112578
Step 175: 112578 + 647 = 113225
Step 176: 113225 + 647 = 113872
Step 177: 113872 + 647 = 114519
Step 178: 114519 + 647 = 115166
Step 179: 115166 + 647 = 115813
Step 180: 115813 + 647 = 116460
Step 181: 116460 + 647 = 117107
Step 182: 117107 + 647 = 117754
Step 183: 117754 + 647 = 118401
Step 184: 118401 + 647 = 119048
Step 185: 119048 + 647 = 119695
Step 186: 119695 + 647 = 120342
Step 187: 120342 + 647 = 120989
Step 188: 120989 + 647 = 121636
Step 189: 121636 + 647 = 122283
Step 190: 122283 + 647 = 122930
Step 191: 122930 + 647 = 123577
Step 192: 123577 + 647 = 124224
Step 193: 124224 + 647 = 124871
Step 194: 124871 + 647 = 125518
Step 195: 125518 + 647 = 126165
Step 196: 126165 + 647 = 126812
Step 197: 126812 + 647 = 127459
Step 198: 127459 + 647 = 128106
Step 199: 128106 + 647 = 128753
Step 200: 128753 + 647 = 129400
Step 201: 129400 + 647 = 130047
Step 202: 130047 + 647 = 130694
Step 203: 130694 + 647 = 131341
Step 204: 131341 + 647 = 131988
Step 205: 131988 + 647 = 132635
Step 206: 132635 + 647 = 133282
Step 207: 133282 + 647 = 133929
Step 208: 133929 + 647 = 134576
Step 209: 134576 + 647 = 135223
Step 210: 135223 + 647 = 135870
Step 211: 135870 + 647 = 136517
Step 212: 136517 + 647 = 137164
Step 213: 137164 + 647 = 137811
Step 214: 137811 + 647 = 138458
Step 215: 138458 + 647 = 139105
Step 216: 139105 + 647 = 139752
Step 217: 139752 + 647 = 140399
Step 218: 140399 + 647 = 141046
Step 219: 141046 + 647 = 141693
Step 220: 141693 + 647 = 142340
Step 221: 142340 + 647 = 142987
Step 222: 142987 + 647 = 143634
Step 223: 143634 + 647 = 144281
Step 224: 144281 + 647 = 144928
Step 225: 144928 + 647 = 145575
Step 226: 145575 + 647 = 146222
Step 227: 146222 + 647 = 146869
Step 228: 146869 + 647 = 147516
Step 229: 147516 + 647 = 148163
Step 230: 148163 + 647 = 148810
Step 231: 148810 + 647 = 149457
Step 232: 149457 + 647 = 150104
Step 233: 150104 + 647 = 150751
Step 234: 150751 + 647 = 151398
Step 235: 151398 + 647 = 152045
Step 236: 152045 + 647 = 152692
Step 237: 152692 + 647 = 153339
Step 238: 153339 + 647 = 153986
Step 239: 153986 + 647 = 154633
Step 240: 154633 + 647 = 155280
Step 241: 155280 + 647 = 155927
Step 242: 155927 + 647 = 156574
Step 243: 156574 + 647 = 157221
Step 244: 157221 + 647 = 157868
Step 245: 157868 + 647 = 158515
Step 246: 158515 + 647 = 159162
Step 247: 159162 + 647 = 159809
Step 248: 159809 + 647 = 160456
Step 249: 160456 + 647 = 161103
Step 250: 161103 + 647 = 161750
Step 251: 161750 + 647 = 162397
Step 252: 162397 + 647 = 163044
Step 253: 163044 + 647 = 163691
Step 254: 163691 + 647 = 164338
Step 255: 164338 + 647 = 164985
Step 256: 164985 + 647 = 165632
Step 257: 165632 + 647 = 166279
Step 258: 166279 + 647 = 166926
Step 259: 166926 + 647 = 167573
Step 260: 167573 + 647 = 168220
Step 261: 168220 + 647 = 168867
Step 262: 168867 + 647 = 169514
Step 263: 169514 + 647 = 170161
Step 264: 170161 + 647 = 170808
Step 265: 170808 + 647 = 171455
Step 266: 171455 + 647 = 172102
Step 267: 172102 + 647 = 172749
Step 268: 172749 + 647 = 173396
Step 269: 173396 + 647 = 174043
Step 270: 174043 + 647 = 174690
Step 271: 174690 + 647 = 175337
Step 272: 175337 + 647 = 175984
Step 273: 175984 + 647 = 176631
Step 274: 176631 + 647 = 177278
Step 275: 177278 + 647 = 177925
Step 276: 177925 + 647 = 178572
Step 277: 178572 + 647 = 179219
Step 278: 179219 + 647 = 179866
Step 279: 179866 + 647 = 180513
Step 280: 180513 + 647 = 181160
Step 281: 181160 + 647 = 181807
Step 282: 181807 + 647 = 182454
Step 283: 182454 + 647 = 183101
Step 284: 183101 + 647 = 183748
Step 285: 183748 + 647 = 184395
Step 286: 184395 + 647 = 185042
Step 287: 185042 + 647 = 185689
Step 288: 185689 + 647 = 186336
Step 289: 186336 + 647 = 186983
Step 290: 186983 + 647 = 187630
Step 291: 187630 + 647 = 188277
Step 292: 188277 + 647 = 188924
Step 293: 188924 + 647 = 189571
Step 294: 189571 + 647 = 190218
Step 295: 190218 + 647 = 190865
Step 296: 190865 + 647 = 191512
Step 297: 191512 + 647 = 192159
Step 298: 192159 + 647 = 192806
Step 299: 192806 + 647 = 193453
Step 300: 193453 + 647 = 194100
Step 301: 194100 + 647 = 194747
Step 302: 194747 + 647 = 195394
Step 303: 195394 + 647 = 196041
Step 304: 196041 + 647 = 196688
Step 305: 196688 + 647 = 197335
Step 306: 197335 + 647 = 197982
Step 307: 197982 + 647 = 198629
Step 308: 198629 + 647 = 199276
Step 309: 199276 + 647 = 199923
Step 310: 199923 + 647 = 200570
Step 311: 200570 + 647 = 201217
Step 312: 201217 + 647 = 201864
Step 313: 201864 + 647 = 202511
Step 314: 202511 + 647 = 203158
Step 315: 203158 + 647 = 203805
Step 316: 203805 + 647 = 204452
Step 317: 204452 + 647 = 205099
Step 318: 205099 + 647 = 205746
Step 319: 205746 + 647 = 206393
Step 320: 206393 + 647 = 207040
Step 321: 207040 + 647 = 207687
Step 322: 207687 + 647 = 208334
Step 323: 208334 + 647 = 208981
Step 324: 208981 + 647 = 209628
Step 325: 209628 + 647 = 210275
Step 326: 210275 + 647 = 210922
Step 327: 210922 + 647 = 211569
Step 328: 211569 + 647 = 212216
Step 329: 212216 + 647 = 212863
Step 330: 212863 + 647 = 213510
Step 331: 213510 + 647 = 214157
Step 332: 214157 + 647 = 214804
Step 333: 214804 + 647 = 215451
Step 334: 215451 + 647 = 216098
Step 335: 216098 + 647 = 216745
Step 336: 216745 + 647 = 217392
Step 337: 217392 + 647 = 218039
Step 338: 218039 + 647 = 218686
Step 339: 218686 + 647 = 219333
Step 340: 219333 + 647 = 219980
Step 341: 219980 + 647 = 220627
Step 342: 220627 + 647 = 221274
Step 343: 221274 + 647 = 221921
Step 344: 221921 + 647 = 222568
Step 345: 222568 + 647 = 223215
Step 346: 223215 + 647 = 223862
Step 347: 223862 + 647 = 224509
Step 348: 224509 + 647 = 225156
Step 349: 225156 + 647 = 225803
Step 350: 225803 + 647 = 226450
Step 351: 226450 + 647 = 227097
Step 352: 227097 + 647 = 227744
Step 353: 227744 + 647 = 228391
Step 354: 228391 + 647 = 229038
Step 355: 229038 + 647 = 229685
Step 356: 229685 + 647 = 230332
Step 357: 230332 + 647 = 230979
Step 358: 230979 + 647 = 231626
Step 359: 231626 + 647 = 232273
Step 360: 232273 + 647 = 232920
Step 361: 232920 + 647 = 233567
Step 362: 233567 + 647 = 234214
Step 363: 234214 + 647 = 234861
Step 364: 234861 + 647 = 235508
Step 365: 235508 + 647 = 236155
Step 366: 236155 + 647 = 236802
Step 367: 236802 + 647 = 237449
Step 368: 237449 + 647 = 238096
Step 369: 238096 + 647 = 238743
Step 370: 238743 + 647 = 239390
Step 371: 239390 + 647 = 240037
Step 372: 240037 + 647 = 240684
Step 373: 240684 + 647 = 241331
Step 374: 241331 + 647 = 241978
Step 375: 241978 + 647 = 242625
Step 376: 242625 + 647 = 243272
Step 377: 243272 + 647 = 243919
Step 378: 243919 + 647 = 244566
Step 379: 244566 + 647 = 245213
Step 380: 245213 + 647 = 245860
Step 381: 245860 + 647 = 246507
Step 382: 246507 + 647 = 247154
Step 383: 247154 + 647 = 247801
Step 384: 247801 + 647 = 248448
Step 385: 248448 + 647 = 249095
Step 386: 249095 + 647 = 249742
Step 387: 249742 + 647 = 250389
Step 388: 250389 + 647 = 251036
Step 389: 251036 + 647 = 251683
Step 390: 251683 + 647 = 252330
Step 391: 252330 + 647 = 252977
Step 392: 252977 + 647 = 253624

So, 647*392 = 253624