Let's roll up our sleeves and solve this. We have 409 and we're going to multiply it by 142, essentially adding 409 to itself 142 times.
Step 1: 0 + 409 = 409
Step 2: 409 + 409 = 818
Step 3: 818 + 409 = 1227
Step 4: 1227 + 409 = 1636
Step 5: 1636 + 409 = 2045
Step 6: 2045 + 409 = 2454
Step 7: 2454 + 409 = 2863
Step 8: 2863 + 409 = 3272
Step 9: 3272 + 409 = 3681
Step 10: 3681 + 409 = 4090
Step 11: 4090 + 409 = 4499
Step 12: 4499 + 409 = 4908
Step 13: 4908 + 409 = 5317
Step 14: 5317 + 409 = 5726
Step 15: 5726 + 409 = 6135
Step 16: 6135 + 409 = 6544
Step 17: 6544 + 409 = 6953
Step 18: 6953 + 409 = 7362
Step 19: 7362 + 409 = 7771
Step 20: 7771 + 409 = 8180
Step 21: 8180 + 409 = 8589
Step 22: 8589 + 409 = 8998
Step 23: 8998 + 409 = 9407
Step 24: 9407 + 409 = 9816
Step 25: 9816 + 409 = 10225
Step 26: 10225 + 409 = 10634
Step 27: 10634 + 409 = 11043
Step 28: 11043 + 409 = 11452
Step 29: 11452 + 409 = 11861
Step 30: 11861 + 409 = 12270
Step 31: 12270 + 409 = 12679
Step 32: 12679 + 409 = 13088
Step 33: 13088 + 409 = 13497
Step 34: 13497 + 409 = 13906
Step 35: 13906 + 409 = 14315
Step 36: 14315 + 409 = 14724
Step 37: 14724 + 409 = 15133
Step 38: 15133 + 409 = 15542
Step 39: 15542 + 409 = 15951
Step 40: 15951 + 409 = 16360
Step 41: 16360 + 409 = 16769
Step 42: 16769 + 409 = 17178
Step 43: 17178 + 409 = 17587
Step 44: 17587 + 409 = 17996
Step 45: 17996 + 409 = 18405
Step 46: 18405 + 409 = 18814
Step 47: 18814 + 409 = 19223
Step 48: 19223 + 409 = 19632
Step 49: 19632 + 409 = 20041
Step 50: 20041 + 409 = 20450
Step 51: 20450 + 409 = 20859
Step 52: 20859 + 409 = 21268
Step 53: 21268 + 409 = 21677
Step 54: 21677 + 409 = 22086
Step 55: 22086 + 409 = 22495
Step 56: 22495 + 409 = 22904
Step 57: 22904 + 409 = 23313
Step 58: 23313 + 409 = 23722
Step 59: 23722 + 409 = 24131
Step 60: 24131 + 409 = 24540
Step 61: 24540 + 409 = 24949
Step 62: 24949 + 409 = 25358
Step 63: 25358 + 409 = 25767
Step 64: 25767 + 409 = 26176
Step 65: 26176 + 409 = 26585
Step 66: 26585 + 409 = 26994
Step 67: 26994 + 409 = 27403
Step 68: 27403 + 409 = 27812
Step 69: 27812 + 409 = 28221
Step 70: 28221 + 409 = 28630
Step 71: 28630 + 409 = 29039
Step 72: 29039 + 409 = 29448
Step 73: 29448 + 409 = 29857
Step 74: 29857 + 409 = 30266
Step 75: 30266 + 409 = 30675
Step 76: 30675 + 409 = 31084
Step 77: 31084 + 409 = 31493
Step 78: 31493 + 409 = 31902
Step 79: 31902 + 409 = 32311
Step 80: 32311 + 409 = 32720
Step 81: 32720 + 409 = 33129
Step 82: 33129 + 409 = 33538
Step 83: 33538 + 409 = 33947
Step 84: 33947 + 409 = 34356
Step 85: 34356 + 409 = 34765
Step 86: 34765 + 409 = 35174
Step 87: 35174 + 409 = 35583
Step 88: 35583 + 409 = 35992
Step 89: 35992 + 409 = 36401
Step 90: 36401 + 409 = 36810
Step 91: 36810 + 409 = 37219
Step 92: 37219 + 409 = 37628
Step 93: 37628 + 409 = 38037
Step 94: 38037 + 409 = 38446
Step 95: 38446 + 409 = 38855
Step 96: 38855 + 409 = 39264
Step 97: 39264 + 409 = 39673
Step 98: 39673 + 409 = 40082
Step 99: 40082 + 409 = 40491
Step 100: 40491 + 409 = 40900
Step 101: 40900 + 409 = 41309
Step 102: 41309 + 409 = 41718
Step 103: 41718 + 409 = 42127
Step 104: 42127 + 409 = 42536
Step 105: 42536 + 409 = 42945
Step 106: 42945 + 409 = 43354
Step 107: 43354 + 409 = 43763
Step 108: 43763 + 409 = 44172
Step 109: 44172 + 409 = 44581
Step 110: 44581 + 409 = 44990
Step 111: 44990 + 409 = 45399
Step 112: 45399 + 409 = 45808
Step 113: 45808 + 409 = 46217
Step 114: 46217 + 409 = 46626
Step 115: 46626 + 409 = 47035
Step 116: 47035 + 409 = 47444
Step 117: 47444 + 409 = 47853
Step 118: 47853 + 409 = 48262
Step 119: 48262 + 409 = 48671
Step 120: 48671 + 409 = 49080
Step 121: 49080 + 409 = 49489
Step 122: 49489 + 409 = 49898
Step 123: 49898 + 409 = 50307
Step 124: 50307 + 409 = 50716
Step 125: 50716 + 409 = 51125
Step 126: 51125 + 409 = 51534
Step 127: 51534 + 409 = 51943
Step 128: 51943 + 409 = 52352
Step 129: 52352 + 409 = 52761
Step 130: 52761 + 409 = 53170
Step 131: 53170 + 409 = 53579
Step 132: 53579 + 409 = 53988
Step 133: 53988 + 409 = 54397
Step 134: 54397 + 409 = 54806
Step 135: 54806 + 409 = 55215
Step 136: 55215 + 409 = 55624
Step 137: 55624 + 409 = 56033
Step 138: 56033 + 409 = 56442
Step 139: 56442 + 409 = 56851
Step 140: 56851 + 409 = 57260
Step 141: 57260 + 409 = 57669
Step 142: 57669 + 409 = 58078

So, 409*142 = 58078