OK, let's work through this together. We're starting with 415 and we're going to multiply it by 139, which means we add 415 to itself 139 times.
Step 1: 0 + 415 = 415
Step 2: 415 + 415 = 830
Step 3: 830 + 415 = 1245
Step 4: 1245 + 415 = 1660
Step 5: 1660 + 415 = 2075
Step 6: 2075 + 415 = 2490
Step 7: 2490 + 415 = 2905
Step 8: 2905 + 415 = 3320
Step 9: 3320 + 415 = 3735
Step 10: 3735 + 415 = 4150
Step 11: 4150 + 415 = 4565
Step 12: 4565 + 415 = 4980
Step 13: 4980 + 415 = 5395
Step 14: 5395 + 415 = 5810
Step 15: 5810 + 415 = 6225
Step 16: 6225 + 415 = 6640
Step 17: 6640 + 415 = 7055
Step 18: 7055 + 415 = 7470
Step 19: 7470 + 415 = 7885
Step 20: 7885 + 415 = 8300
Step 21: 8300 + 415 = 8715
Step 22: 8715 + 415 = 9130
Step 23: 9130 + 415 = 9545
Step 24: 9545 + 415 = 9960
Step 25: 9960 + 415 = 10375
Step 26: 10375 + 415 = 10790
Step 27: 10790 + 415 = 11205
Step 28: 11205 + 415 = 11620
Step 29: 11620 + 415 = 12035
Step 30: 12035 + 415 = 12450
Step 31: 12450 + 415 = 12865
Step 32: 12865 + 415 = 13280
Step 33: 13280 + 415 = 13695
Step 34: 13695 + 415 = 14110
Step 35: 14110 + 415 = 14525
Step 36: 14525 + 415 = 14940
Step 37: 14940 + 415 = 15355
Step 38: 15355 + 415 = 15770
Step 39: 15770 + 415 = 16185
Step 40: 16185 + 415 = 16600
Step 41: 16600 + 415 = 17015
Step 42: 17015 + 415 = 17430
Step 43: 17430 + 415 = 17845
Step 44: 17845 + 415 = 18260
Step 45: 18260 + 415 = 18675
Step 46: 18675 + 415 = 19090
Step 47: 19090 + 415 = 19505
Step 48: 19505 + 415 = 19920
Step 49: 19920 + 415 = 20335
Step 50: 20335 + 415 = 20750
Step 51: 20750 + 415 = 21165
Step 52: 21165 + 415 = 21580
Step 53: 21580 + 415 = 21995
Step 54: 21995 + 415 = 22410
Step 55: 22410 + 415 = 22825
Step 56: 22825 + 415 = 23240
Step 57: 23240 + 415 = 23655
Step 58: 23655 + 415 = 24070
Step 59: 24070 + 415 = 24485
Step 60: 24485 + 415 = 24900
Step 61: 24900 + 415 = 25315
Step 62: 25315 + 415 = 25730
Step 63: 25730 + 415 = 26145
Step 64: 26145 + 415 = 26560
Step 65: 26560 + 415 = 26975
Step 66: 26975 + 415 = 27390
Step 67: 27390 + 415 = 27805
Step 68: 27805 + 415 = 28220
Step 69: 28220 + 415 = 28635
Step 70: 28635 + 415 = 29050
Step 71: 29050 + 415 = 29465
Step 72: 29465 + 415 = 29880
Step 73: 29880 + 415 = 30295
Step 74: 30295 + 415 = 30710
Step 75: 30710 + 415 = 31125
Step 76: 31125 + 415 = 31540
Step 77: 31540 + 415 = 31955
Step 78: 31955 + 415 = 32370
Step 79: 32370 + 415 = 32785
Step 80: 32785 + 415 = 33200
Step 81: 33200 + 415 = 33615
Step 82: 33615 + 415 = 34030
Step 83: 34030 + 415 = 34445
Step 84: 34445 + 415 = 34860
Step 85: 34860 + 415 = 35275
Step 86: 35275 + 415 = 35690
Step 87: 35690 + 415 = 36105
Step 88: 36105 + 415 = 36520
Step 89: 36520 + 415 = 36935
Step 90: 36935 + 415 = 37350
Step 91: 37350 + 415 = 37765
Step 92: 37765 + 415 = 38180
Step 93: 38180 + 415 = 38595
Step 94: 38595 + 415 = 39010
Step 95: 39010 + 415 = 39425
Step 96: 39425 + 415 = 39840
Step 97: 39840 + 415 = 40255
Step 98: 40255 + 415 = 40670
Step 99: 40670 + 415 = 41085
Step 100: 41085 + 415 = 41500
Step 101: 41500 + 415 = 41915
Step 102: 41915 + 415 = 42330
Step 103: 42330 + 415 = 42745
Step 104: 42745 + 415 = 43160
Step 105: 43160 + 415 = 43575
Step 106: 43575 + 415 = 43990
Step 107: 43990 + 415 = 44405
Step 108: 44405 + 415 = 44820
Step 109: 44820 + 415 = 45235
Step 110: 45235 + 415 = 45650
Step 111: 45650 + 415 = 46065
Step 112: 46065 + 415 = 46480
Step 113: 46480 + 415 = 46895
Step 114: 46895 + 415 = 47310
Step 115: 47310 + 415 = 47725
Step 116: 47725 + 415 = 48140
Step 117: 48140 + 415 = 48555
Step 118: 48555 + 415 = 48970
Step 119: 48970 + 415 = 49385
Step 120: 49385 + 415 = 49800
Step 121: 49800 + 415 = 50215
Step 122: 50215 + 415 = 50630
Step 123: 50630 + 415 = 51045
Step 124: 51045 + 415 = 51460
Step 125: 51460 + 415 = 51875
Step 126: 51875 + 415 = 52290
Step 127: 52290 + 415 = 52705
Step 128: 52705 + 415 = 53120
Step 129: 53120 + 415 = 53535
Step 130: 53535 + 415 = 53950
Step 131: 53950 + 415 = 54365
Step 132: 54365 + 415 = 54780
Step 133: 54780 + 415 = 55195
Step 134: 55195 + 415 = 55610
Step 135: 55610 + 415 = 56025
Step 136: 56025 + 415 = 56440
Step 137: 56440 + 415 = 56855
Step 138: 56855 + 415 = 57270
Step 139: 57270 + 415 = 57685

So, 415*139 = 57685