Let's roll up our sleeves and solve this. We have 407 and we're going to multiply it by 253, essentially adding 407 to itself 253 times.
Step 1: 0 + 407 = 407
Step 2: 407 + 407 = 814
Step 3: 814 + 407 = 1221
Step 4: 1221 + 407 = 1628
Step 5: 1628 + 407 = 2035
Step 6: 2035 + 407 = 2442
Step 7: 2442 + 407 = 2849
Step 8: 2849 + 407 = 3256
Step 9: 3256 + 407 = 3663
Step 10: 3663 + 407 = 4070
Step 11: 4070 + 407 = 4477
Step 12: 4477 + 407 = 4884
Step 13: 4884 + 407 = 5291
Step 14: 5291 + 407 = 5698
Step 15: 5698 + 407 = 6105
Step 16: 6105 + 407 = 6512
Step 17: 6512 + 407 = 6919
Step 18: 6919 + 407 = 7326
Step 19: 7326 + 407 = 7733
Step 20: 7733 + 407 = 8140
Step 21: 8140 + 407 = 8547
Step 22: 8547 + 407 = 8954
Step 23: 8954 + 407 = 9361
Step 24: 9361 + 407 = 9768
Step 25: 9768 + 407 = 10175
Step 26: 10175 + 407 = 10582
Step 27: 10582 + 407 = 10989
Step 28: 10989 + 407 = 11396
Step 29: 11396 + 407 = 11803
Step 30: 11803 + 407 = 12210
Step 31: 12210 + 407 = 12617
Step 32: 12617 + 407 = 13024
Step 33: 13024 + 407 = 13431
Step 34: 13431 + 407 = 13838
Step 35: 13838 + 407 = 14245
Step 36: 14245 + 407 = 14652
Step 37: 14652 + 407 = 15059
Step 38: 15059 + 407 = 15466
Step 39: 15466 + 407 = 15873
Step 40: 15873 + 407 = 16280
Step 41: 16280 + 407 = 16687
Step 42: 16687 + 407 = 17094
Step 43: 17094 + 407 = 17501
Step 44: 17501 + 407 = 17908
Step 45: 17908 + 407 = 18315
Step 46: 18315 + 407 = 18722
Step 47: 18722 + 407 = 19129
Step 48: 19129 + 407 = 19536
Step 49: 19536 + 407 = 19943
Step 50: 19943 + 407 = 20350
Step 51: 20350 + 407 = 20757
Step 52: 20757 + 407 = 21164
Step 53: 21164 + 407 = 21571
Step 54: 21571 + 407 = 21978
Step 55: 21978 + 407 = 22385
Step 56: 22385 + 407 = 22792
Step 57: 22792 + 407 = 23199
Step 58: 23199 + 407 = 23606
Step 59: 23606 + 407 = 24013
Step 60: 24013 + 407 = 24420
Step 61: 24420 + 407 = 24827
Step 62: 24827 + 407 = 25234
Step 63: 25234 + 407 = 25641
Step 64: 25641 + 407 = 26048
Step 65: 26048 + 407 = 26455
Step 66: 26455 + 407 = 26862
Step 67: 26862 + 407 = 27269
Step 68: 27269 + 407 = 27676
Step 69: 27676 + 407 = 28083
Step 70: 28083 + 407 = 28490
Step 71: 28490 + 407 = 28897
Step 72: 28897 + 407 = 29304
Step 73: 29304 + 407 = 29711
Step 74: 29711 + 407 = 30118
Step 75: 30118 + 407 = 30525
Step 76: 30525 + 407 = 30932
Step 77: 30932 + 407 = 31339
Step 78: 31339 + 407 = 31746
Step 79: 31746 + 407 = 32153
Step 80: 32153 + 407 = 32560
Step 81: 32560 + 407 = 32967
Step 82: 32967 + 407 = 33374
Step 83: 33374 + 407 = 33781
Step 84: 33781 + 407 = 34188
Step 85: 34188 + 407 = 34595
Step 86: 34595 + 407 = 35002
Step 87: 35002 + 407 = 35409
Step 88: 35409 + 407 = 35816
Step 89: 35816 + 407 = 36223
Step 90: 36223 + 407 = 36630
Step 91: 36630 + 407 = 37037
Step 92: 37037 + 407 = 37444
Step 93: 37444 + 407 = 37851
Step 94: 37851 + 407 = 38258
Step 95: 38258 + 407 = 38665
Step 96: 38665 + 407 = 39072
Step 97: 39072 + 407 = 39479
Step 98: 39479 + 407 = 39886
Step 99: 39886 + 407 = 40293
Step 100: 40293 + 407 = 40700
Step 101: 40700 + 407 = 41107
Step 102: 41107 + 407 = 41514
Step 103: 41514 + 407 = 41921
Step 104: 41921 + 407 = 42328
Step 105: 42328 + 407 = 42735
Step 106: 42735 + 407 = 43142
Step 107: 43142 + 407 = 43549
Step 108: 43549 + 407 = 43956
Step 109: 43956 + 407 = 44363
Step 110: 44363 + 407 = 44770
Step 111: 44770 + 407 = 45177
Step 112: 45177 + 407 = 45584
Step 113: 45584 + 407 = 45991
Step 114: 45991 + 407 = 46398
Step 115: 46398 + 407 = 46805
Step 116: 46805 + 407 = 47212
Step 117: 47212 + 407 = 47619
Step 118: 47619 + 407 = 48026
Step 119: 48026 + 407 = 48433
Step 120: 48433 + 407 = 48840
Step 121: 48840 + 407 = 49247
Step 122: 49247 + 407 = 49654
Step 123: 49654 + 407 = 50061
Step 124: 50061 + 407 = 50468
Step 125: 50468 + 407 = 50875
Step 126: 50875 + 407 = 51282
Step 127: 51282 + 407 = 51689
Step 128: 51689 + 407 = 52096
Step 129: 52096 + 407 = 52503
Step 130: 52503 + 407 = 52910
Step 131: 52910 + 407 = 53317
Step 132: 53317 + 407 = 53724
Step 133: 53724 + 407 = 54131
Step 134: 54131 + 407 = 54538
Step 135: 54538 + 407 = 54945
Step 136: 54945 + 407 = 55352
Step 137: 55352 + 407 = 55759
Step 138: 55759 + 407 = 56166
Step 139: 56166 + 407 = 56573
Step 140: 56573 + 407 = 56980
Step 141: 56980 + 407 = 57387
Step 142: 57387 + 407 = 57794
Step 143: 57794 + 407 = 58201
Step 144: 58201 + 407 = 58608
Step 145: 58608 + 407 = 59015
Step 146: 59015 + 407 = 59422
Step 147: 59422 + 407 = 59829
Step 148: 59829 + 407 = 60236
Step 149: 60236 + 407 = 60643
Step 150: 60643 + 407 = 61050
Step 151: 61050 + 407 = 61457
Step 152: 61457 + 407 = 61864
Step 153: 61864 + 407 = 62271
Step 154: 62271 + 407 = 62678
Step 155: 62678 + 407 = 63085
Step 156: 63085 + 407 = 63492
Step 157: 63492 + 407 = 63899
Step 158: 63899 + 407 = 64306
Step 159: 64306 + 407 = 64713
Step 160: 64713 + 407 = 65120
Step 161: 65120 + 407 = 65527
Step 162: 65527 + 407 = 65934
Step 163: 65934 + 407 = 66341
Step 164: 66341 + 407 = 66748
Step 165: 66748 + 407 = 67155
Step 166: 67155 + 407 = 67562
Step 167: 67562 + 407 = 67969
Step 168: 67969 + 407 = 68376
Step 169: 68376 + 407 = 68783
Step 170: 68783 + 407 = 69190
Step 171: 69190 + 407 = 69597
Step 172: 69597 + 407 = 70004
Step 173: 70004 + 407 = 70411
Step 174: 70411 + 407 = 70818
Step 175: 70818 + 407 = 71225
Step 176: 71225 + 407 = 71632
Step 177: 71632 + 407 = 72039
Step 178: 72039 + 407 = 72446
Step 179: 72446 + 407 = 72853
Step 180: 72853 + 407 = 73260
Step 181: 73260 + 407 = 73667
Step 182: 73667 + 407 = 74074
Step 183: 74074 + 407 = 74481
Step 184: 74481 + 407 = 74888
Step 185: 74888 + 407 = 75295
Step 186: 75295 + 407 = 75702
Step 187: 75702 + 407 = 76109
Step 188: 76109 + 407 = 76516
Step 189: 76516 + 407 = 76923
Step 190: 76923 + 407 = 77330
Step 191: 77330 + 407 = 77737
Step 192: 77737 + 407 = 78144
Step 193: 78144 + 407 = 78551
Step 194: 78551 + 407 = 78958
Step 195: 78958 + 407 = 79365
Step 196: 79365 + 407 = 79772
Step 197: 79772 + 407 = 80179
Step 198: 80179 + 407 = 80586
Step 199: 80586 + 407 = 80993
Step 200: 80993 + 407 = 81400
Step 201: 81400 + 407 = 81807
Step 202: 81807 + 407 = 82214
Step 203: 82214 + 407 = 82621
Step 204: 82621 + 407 = 83028
Step 205: 83028 + 407 = 83435
Step 206: 83435 + 407 = 83842
Step 207: 83842 + 407 = 84249
Step 208: 84249 + 407 = 84656
Step 209: 84656 + 407 = 85063
Step 210: 85063 + 407 = 85470
Step 211: 85470 + 407 = 85877
Step 212: 85877 + 407 = 86284
Step 213: 86284 + 407 = 86691
Step 214: 86691 + 407 = 87098
Step 215: 87098 + 407 = 87505
Step 216: 87505 + 407 = 87912
Step 217: 87912 + 407 = 88319
Step 218: 88319 + 407 = 88726
Step 219: 88726 + 407 = 89133
Step 220: 89133 + 407 = 89540
Step 221: 89540 + 407 = 89947
Step 222: 89947 + 407 = 90354
Step 223: 90354 + 407 = 90761
Step 224: 90761 + 407 = 91168
Step 225: 91168 + 407 = 91575
Step 226: 91575 + 407 = 91982
Step 227: 91982 + 407 = 92389
Step 228: 92389 + 407 = 92796
Step 229: 92796 + 407 = 93203
Step 230: 93203 + 407 = 93610
Step 231: 93610 + 407 = 94017
Step 232: 94017 + 407 = 94424
Step 233: 94424 + 407 = 94831
Step 234: 94831 + 407 = 95238
Step 235: 95238 + 407 = 95645
Step 236: 95645 + 407 = 96052
Step 237: 96052 + 407 = 96459
Step 238: 96459 + 407 = 96866
Step 239: 96866 + 407 = 97273
Step 240: 97273 + 407 = 97680
Step 241: 97680 + 407 = 98087
Step 242: 98087 + 407 = 98494
Step 243: 98494 + 407 = 98901
Step 244: 98901 + 407 = 99308
Step 245: 99308 + 407 = 99715
Step 246: 99715 + 407 = 100122
Step 247: 100122 + 407 = 100529
Step 248: 100529 + 407 = 100936
Step 249: 100936 + 407 = 101343
Step 250: 101343 + 407 = 101750
Step 251: 101750 + 407 = 102157
Step 252: 102157 + 407 = 102564
Step 253: 102564 + 407 = 102971

So, 407*253 = 102971