Let's get this math done. We have 157 and we're going to multiply it by 409. This is the same as taking 157 and adding it to itself 409 times.
Step 1: 0 + 157 = 157
Step 2: 157 + 157 = 314
Step 3: 314 + 157 = 471
Step 4: 471 + 157 = 628
Step 5: 628 + 157 = 785
Step 6: 785 + 157 = 942
Step 7: 942 + 157 = 1099
Step 8: 1099 + 157 = 1256
Step 9: 1256 + 157 = 1413
Step 10: 1413 + 157 = 1570
Step 11: 1570 + 157 = 1727
Step 12: 1727 + 157 = 1884
Step 13: 1884 + 157 = 2041
Step 14: 2041 + 157 = 2198
Step 15: 2198 + 157 = 2355
Step 16: 2355 + 157 = 2512
Step 17: 2512 + 157 = 2669
Step 18: 2669 + 157 = 2826
Step 19: 2826 + 157 = 2983
Step 20: 2983 + 157 = 3140
Step 21: 3140 + 157 = 3297
Step 22: 3297 + 157 = 3454
Step 23: 3454 + 157 = 3611
Step 24: 3611 + 157 = 3768
Step 25: 3768 + 157 = 3925
Step 26: 3925 + 157 = 4082
Step 27: 4082 + 157 = 4239
Step 28: 4239 + 157 = 4396
Step 29: 4396 + 157 = 4553
Step 30: 4553 + 157 = 4710
Step 31: 4710 + 157 = 4867
Step 32: 4867 + 157 = 5024
Step 33: 5024 + 157 = 5181
Step 34: 5181 + 157 = 5338
Step 35: 5338 + 157 = 5495
Step 36: 5495 + 157 = 5652
Step 37: 5652 + 157 = 5809
Step 38: 5809 + 157 = 5966
Step 39: 5966 + 157 = 6123
Step 40: 6123 + 157 = 6280
Step 41: 6280 + 157 = 6437
Step 42: 6437 + 157 = 6594
Step 43: 6594 + 157 = 6751
Step 44: 6751 + 157 = 6908
Step 45: 6908 + 157 = 7065
Step 46: 7065 + 157 = 7222
Step 47: 7222 + 157 = 7379
Step 48: 7379 + 157 = 7536
Step 49: 7536 + 157 = 7693
Step 50: 7693 + 157 = 7850
Step 51: 7850 + 157 = 8007
Step 52: 8007 + 157 = 8164
Step 53: 8164 + 157 = 8321
Step 54: 8321 + 157 = 8478
Step 55: 8478 + 157 = 8635
Step 56: 8635 + 157 = 8792
Step 57: 8792 + 157 = 8949
Step 58: 8949 + 157 = 9106
Step 59: 9106 + 157 = 9263
Step 60: 9263 + 157 = 9420
Step 61: 9420 + 157 = 9577
Step 62: 9577 + 157 = 9734
Step 63: 9734 + 157 = 9891
Step 64: 9891 + 157 = 10048
Step 65: 10048 + 157 = 10205
Step 66: 10205 + 157 = 10362
Step 67: 10362 + 157 = 10519
Step 68: 10519 + 157 = 10676
Step 69: 10676 + 157 = 10833
Step 70: 10833 + 157 = 10990
Step 71: 10990 + 157 = 11147
Step 72: 11147 + 157 = 11304
Step 73: 11304 + 157 = 11461
Step 74: 11461 + 157 = 11618
Step 75: 11618 + 157 = 11775
Step 76: 11775 + 157 = 11932
Step 77: 11932 + 157 = 12089
Step 78: 12089 + 157 = 12246
Step 79: 12246 + 157 = 12403
Step 80: 12403 + 157 = 12560
Step 81: 12560 + 157 = 12717
Step 82: 12717 + 157 = 12874
Step 83: 12874 + 157 = 13031
Step 84: 13031 + 157 = 13188
Step 85: 13188 + 157 = 13345
Step 86: 13345 + 157 = 13502
Step 87: 13502 + 157 = 13659
Step 88: 13659 + 157 = 13816
Step 89: 13816 + 157 = 13973
Step 90: 13973 + 157 = 14130
Step 91: 14130 + 157 = 14287
Step 92: 14287 + 157 = 14444
Step 93: 14444 + 157 = 14601
Step 94: 14601 + 157 = 14758
Step 95: 14758 + 157 = 14915
Step 96: 14915 + 157 = 15072
Step 97: 15072 + 157 = 15229
Step 98: 15229 + 157 = 15386
Step 99: 15386 + 157 = 15543
Step 100: 15543 + 157 = 15700
Step 101: 15700 + 157 = 15857
Step 102: 15857 + 157 = 16014
Step 103: 16014 + 157 = 16171
Step 104: 16171 + 157 = 16328
Step 105: 16328 + 157 = 16485
Step 106: 16485 + 157 = 16642
Step 107: 16642 + 157 = 16799
Step 108: 16799 + 157 = 16956
Step 109: 16956 + 157 = 17113
Step 110: 17113 + 157 = 17270
Step 111: 17270 + 157 = 17427
Step 112: 17427 + 157 = 17584
Step 113: 17584 + 157 = 17741
Step 114: 17741 + 157 = 17898
Step 115: 17898 + 157 = 18055
Step 116: 18055 + 157 = 18212
Step 117: 18212 + 157 = 18369
Step 118: 18369 + 157 = 18526
Step 119: 18526 + 157 = 18683
Step 120: 18683 + 157 = 18840
Step 121: 18840 + 157 = 18997
Step 122: 18997 + 157 = 19154
Step 123: 19154 + 157 = 19311
Step 124: 19311 + 157 = 19468
Step 125: 19468 + 157 = 19625
Step 126: 19625 + 157 = 19782
Step 127: 19782 + 157 = 19939
Step 128: 19939 + 157 = 20096
Step 129: 20096 + 157 = 20253
Step 130: 20253 + 157 = 20410
Step 131: 20410 + 157 = 20567
Step 132: 20567 + 157 = 20724
Step 133: 20724 + 157 = 20881
Step 134: 20881 + 157 = 21038
Step 135: 21038 + 157 = 21195
Step 136: 21195 + 157 = 21352
Step 137: 21352 + 157 = 21509
Step 138: 21509 + 157 = 21666
Step 139: 21666 + 157 = 21823
Step 140: 21823 + 157 = 21980
Step 141: 21980 + 157 = 22137
Step 142: 22137 + 157 = 22294
Step 143: 22294 + 157 = 22451
Step 144: 22451 + 157 = 22608
Step 145: 22608 + 157 = 22765
Step 146: 22765 + 157 = 22922
Step 147: 22922 + 157 = 23079
Step 148: 23079 + 157 = 23236
Step 149: 23236 + 157 = 23393
Step 150: 23393 + 157 = 23550
Step 151: 23550 + 157 = 23707
Step 152: 23707 + 157 = 23864
Step 153: 23864 + 157 = 24021
Step 154: 24021 + 157 = 24178
Step 155: 24178 + 157 = 24335
Step 156: 24335 + 157 = 24492
Step 157: 24492 + 157 = 24649
Step 158: 24649 + 157 = 24806
Step 159: 24806 + 157 = 24963
Step 160: 24963 + 157 = 25120
Step 161: 25120 + 157 = 25277
Step 162: 25277 + 157 = 25434
Step 163: 25434 + 157 = 25591
Step 164: 25591 + 157 = 25748
Step 165: 25748 + 157 = 25905
Step 166: 25905 + 157 = 26062
Step 167: 26062 + 157 = 26219
Step 168: 26219 + 157 = 26376
Step 169: 26376 + 157 = 26533
Step 170: 26533 + 157 = 26690
Step 171: 26690 + 157 = 26847
Step 172: 26847 + 157 = 27004
Step 173: 27004 + 157 = 27161
Step 174: 27161 + 157 = 27318
Step 175: 27318 + 157 = 27475
Step 176: 27475 + 157 = 27632
Step 177: 27632 + 157 = 27789
Step 178: 27789 + 157 = 27946
Step 179: 27946 + 157 = 28103
Step 180: 28103 + 157 = 28260
Step 181: 28260 + 157 = 28417
Step 182: 28417 + 157 = 28574
Step 183: 28574 + 157 = 28731
Step 184: 28731 + 157 = 28888
Step 185: 28888 + 157 = 29045
Step 186: 29045 + 157 = 29202
Step 187: 29202 + 157 = 29359
Step 188: 29359 + 157 = 29516
Step 189: 29516 + 157 = 29673
Step 190: 29673 + 157 = 29830
Step 191: 29830 + 157 = 29987
Step 192: 29987 + 157 = 30144
Step 193: 30144 + 157 = 30301
Step 194: 30301 + 157 = 30458
Step 195: 30458 + 157 = 30615
Step 196: 30615 + 157 = 30772
Step 197: 30772 + 157 = 30929
Step 198: 30929 + 157 = 31086
Step 199: 31086 + 157 = 31243
Step 200: 31243 + 157 = 31400
Step 201: 31400 + 157 = 31557
Step 202: 31557 + 157 = 31714
Step 203: 31714 + 157 = 31871
Step 204: 31871 + 157 = 32028
Step 205: 32028 + 157 = 32185
Step 206: 32185 + 157 = 32342
Step 207: 32342 + 157 = 32499
Step 208: 32499 + 157 = 32656
Step 209: 32656 + 157 = 32813
Step 210: 32813 + 157 = 32970
Step 211: 32970 + 157 = 33127
Step 212: 33127 + 157 = 33284
Step 213: 33284 + 157 = 33441
Step 214: 33441 + 157 = 33598
Step 215: 33598 + 157 = 33755
Step 216: 33755 + 157 = 33912
Step 217: 33912 + 157 = 34069
Step 218: 34069 + 157 = 34226
Step 219: 34226 + 157 = 34383
Step 220: 34383 + 157 = 34540
Step 221: 34540 + 157 = 34697
Step 222: 34697 + 157 = 34854
Step 223: 34854 + 157 = 35011
Step 224: 35011 + 157 = 35168
Step 225: 35168 + 157 = 35325
Step 226: 35325 + 157 = 35482
Step 227: 35482 + 157 = 35639
Step 228: 35639 + 157 = 35796
Step 229: 35796 + 157 = 35953
Step 230: 35953 + 157 = 36110
Step 231: 36110 + 157 = 36267
Step 232: 36267 + 157 = 36424
Step 233: 36424 + 157 = 36581
Step 234: 36581 + 157 = 36738
Step 235: 36738 + 157 = 36895
Step 236: 36895 + 157 = 37052
Step 237: 37052 + 157 = 37209
Step 238: 37209 + 157 = 37366
Step 239: 37366 + 157 = 37523
Step 240: 37523 + 157 = 37680
Step 241: 37680 + 157 = 37837
Step 242: 37837 + 157 = 37994
Step 243: 37994 + 157 = 38151
Step 244: 38151 + 157 = 38308
Step 245: 38308 + 157 = 38465
Step 246: 38465 + 157 = 38622
Step 247: 38622 + 157 = 38779
Step 248: 38779 + 157 = 38936
Step 249: 38936 + 157 = 39093
Step 250: 39093 + 157 = 39250
Step 251: 39250 + 157 = 39407
Step 252: 39407 + 157 = 39564
Step 253: 39564 + 157 = 39721
Step 254: 39721 + 157 = 39878
Step 255: 39878 + 157 = 40035
Step 256: 40035 + 157 = 40192
Step 257: 40192 + 157 = 40349
Step 258: 40349 + 157 = 40506
Step 259: 40506 + 157 = 40663
Step 260: 40663 + 157 = 40820
Step 261: 40820 + 157 = 40977
Step 262: 40977 + 157 = 41134
Step 263: 41134 + 157 = 41291
Step 264: 41291 + 157 = 41448
Step 265: 41448 + 157 = 41605
Step 266: 41605 + 157 = 41762
Step 267: 41762 + 157 = 41919
Step 268: 41919 + 157 = 42076
Step 269: 42076 + 157 = 42233
Step 270: 42233 + 157 = 42390
Step 271: 42390 + 157 = 42547
Step 272: 42547 + 157 = 42704
Step 273: 42704 + 157 = 42861
Step 274: 42861 + 157 = 43018
Step 275: 43018 + 157 = 43175
Step 276: 43175 + 157 = 43332
Step 277: 43332 + 157 = 43489
Step 278: 43489 + 157 = 43646
Step 279: 43646 + 157 = 43803
Step 280: 43803 + 157 = 43960
Step 281: 43960 + 157 = 44117
Step 282: 44117 + 157 = 44274
Step 283: 44274 + 157 = 44431
Step 284: 44431 + 157 = 44588
Step 285: 44588 + 157 = 44745
Step 286: 44745 + 157 = 44902
Step 287: 44902 + 157 = 45059
Step 288: 45059 + 157 = 45216
Step 289: 45216 + 157 = 45373
Step 290: 45373 + 157 = 45530
Step 291: 45530 + 157 = 45687
Step 292: 45687 + 157 = 45844
Step 293: 45844 + 157 = 46001
Step 294: 46001 + 157 = 46158
Step 295: 46158 + 157 = 46315
Step 296: 46315 + 157 = 46472
Step 297: 46472 + 157 = 46629
Step 298: 46629 + 157 = 46786
Step 299: 46786 + 157 = 46943
Step 300: 46943 + 157 = 47100
Step 301: 47100 + 157 = 47257
Step 302: 47257 + 157 = 47414
Step 303: 47414 + 157 = 47571
Step 304: 47571 + 157 = 47728
Step 305: 47728 + 157 = 47885
Step 306: 47885 + 157 = 48042
Step 307: 48042 + 157 = 48199
Step 308: 48199 + 157 = 48356
Step 309: 48356 + 157 = 48513
Step 310: 48513 + 157 = 48670
Step 311: 48670 + 157 = 48827
Step 312: 48827 + 157 = 48984
Step 313: 48984 + 157 = 49141
Step 314: 49141 + 157 = 49298
Step 315: 49298 + 157 = 49455
Step 316: 49455 + 157 = 49612
Step 317: 49612 + 157 = 49769
Step 318: 49769 + 157 = 49926
Step 319: 49926 + 157 = 50083
Step 320: 50083 + 157 = 50240
Step 321: 50240 + 157 = 50397
Step 322: 50397 + 157 = 50554
Step 323: 50554 + 157 = 50711
Step 324: 50711 + 157 = 50868
Step 325: 50868 + 157 = 51025
Step 326: 51025 + 157 = 51182
Step 327: 51182 + 157 = 51339
Step 328: 51339 + 157 = 51496
Step 329: 51496 + 157 = 51653
Step 330: 51653 + 157 = 51810
Step 331: 51810 + 157 = 51967
Step 332: 51967 + 157 = 52124
Step 333: 52124 + 157 = 52281
Step 334: 52281 + 157 = 52438
Step 335: 52438 + 157 = 52595
Step 336: 52595 + 157 = 52752
Step 337: 52752 + 157 = 52909
Step 338: 52909 + 157 = 53066
Step 339: 53066 + 157 = 53223
Step 340: 53223 + 157 = 53380
Step 341: 53380 + 157 = 53537
Step 342: 53537 + 157 = 53694
Step 343: 53694 + 157 = 53851
Step 344: 53851 + 157 = 54008
Step 345: 54008 + 157 = 54165
Step 346: 54165 + 157 = 54322
Step 347: 54322 + 157 = 54479
Step 348: 54479 + 157 = 54636
Step 349: 54636 + 157 = 54793
Step 350: 54793 + 157 = 54950
Step 351: 54950 + 157 = 55107
Step 352: 55107 + 157 = 55264
Step 353: 55264 + 157 = 55421
Step 354: 55421 + 157 = 55578
Step 355: 55578 + 157 = 55735
Step 356: 55735 + 157 = 55892
Step 357: 55892 + 157 = 56049
Step 358: 56049 + 157 = 56206
Step 359: 56206 + 157 = 56363
Step 360: 56363 + 157 = 56520
Step 361: 56520 + 157 = 56677
Step 362: 56677 + 157 = 56834
Step 363: 56834 + 157 = 56991
Step 364: 56991 + 157 = 57148
Step 365: 57148 + 157 = 57305
Step 366: 57305 + 157 = 57462
Step 367: 57462 + 157 = 57619
Step 368: 57619 + 157 = 57776
Step 369: 57776 + 157 = 57933
Step 370: 57933 + 157 = 58090
Step 371: 58090 + 157 = 58247
Step 372: 58247 + 157 = 58404
Step 373: 58404 + 157 = 58561
Step 374: 58561 + 157 = 58718
Step 375: 58718 + 157 = 58875
Step 376: 58875 + 157 = 59032
Step 377: 59032 + 157 = 59189
Step 378: 59189 + 157 = 59346
Step 379: 59346 + 157 = 59503
Step 380: 59503 + 157 = 59660
Step 381: 59660 + 157 = 59817
Step 382: 59817 + 157 = 59974
Step 383: 59974 + 157 = 60131
Step 384: 60131 + 157 = 60288
Step 385: 60288 + 157 = 60445
Step 386: 60445 + 157 = 60602
Step 387: 60602 + 157 = 60759
Step 388: 60759 + 157 = 60916
Step 389: 60916 + 157 = 61073
Step 390: 61073 + 157 = 61230
Step 391: 61230 + 157 = 61387
Step 392: 61387 + 157 = 61544
Step 393: 61544 + 157 = 61701
Step 394: 61701 + 157 = 61858
Step 395: 61858 + 157 = 62015
Step 396: 62015 + 157 = 62172
Step 397: 62172 + 157 = 62329
Step 398: 62329 + 157 = 62486
Step 399: 62486 + 157 = 62643
Step 400: 62643 + 157 = 62800
Step 401: 62800 + 157 = 62957
Step 402: 62957 + 157 = 63114
Step 403: 63114 + 157 = 63271
Step 404: 63271 + 157 = 63428
Step 405: 63428 + 157 = 63585
Step 406: 63585 + 157 = 63742
Step 407: 63742 + 157 = 63899
Step 408: 63899 + 157 = 64056
Step 409: 64056 + 157 = 64213

So, 157*409 = 64213