Let's roll up our sleeves and solve this. We have 103 and we're going to multiply it by 139, essentially adding 103 to itself 139 times.
Step 1: 0 + 103 = 103
Step 2: 103 + 103 = 206
Step 3: 206 + 103 = 309
Step 4: 309 + 103 = 412
Step 5: 412 + 103 = 515
Step 6: 515 + 103 = 618
Step 7: 618 + 103 = 721
Step 8: 721 + 103 = 824
Step 9: 824 + 103 = 927
Step 10: 927 + 103 = 1030
Step 11: 1030 + 103 = 1133
Step 12: 1133 + 103 = 1236
Step 13: 1236 + 103 = 1339
Step 14: 1339 + 103 = 1442
Step 15: 1442 + 103 = 1545
Step 16: 1545 + 103 = 1648
Step 17: 1648 + 103 = 1751
Step 18: 1751 + 103 = 1854
Step 19: 1854 + 103 = 1957
Step 20: 1957 + 103 = 2060
Step 21: 2060 + 103 = 2163
Step 22: 2163 + 103 = 2266
Step 23: 2266 + 103 = 2369
Step 24: 2369 + 103 = 2472
Step 25: 2472 + 103 = 2575
Step 26: 2575 + 103 = 2678
Step 27: 2678 + 103 = 2781
Step 28: 2781 + 103 = 2884
Step 29: 2884 + 103 = 2987
Step 30: 2987 + 103 = 3090
Step 31: 3090 + 103 = 3193
Step 32: 3193 + 103 = 3296
Step 33: 3296 + 103 = 3399
Step 34: 3399 + 103 = 3502
Step 35: 3502 + 103 = 3605
Step 36: 3605 + 103 = 3708
Step 37: 3708 + 103 = 3811
Step 38: 3811 + 103 = 3914
Step 39: 3914 + 103 = 4017
Step 40: 4017 + 103 = 4120
Step 41: 4120 + 103 = 4223
Step 42: 4223 + 103 = 4326
Step 43: 4326 + 103 = 4429
Step 44: 4429 + 103 = 4532
Step 45: 4532 + 103 = 4635
Step 46: 4635 + 103 = 4738
Step 47: 4738 + 103 = 4841
Step 48: 4841 + 103 = 4944
Step 49: 4944 + 103 = 5047
Step 50: 5047 + 103 = 5150
Step 51: 5150 + 103 = 5253
Step 52: 5253 + 103 = 5356
Step 53: 5356 + 103 = 5459
Step 54: 5459 + 103 = 5562
Step 55: 5562 + 103 = 5665
Step 56: 5665 + 103 = 5768
Step 57: 5768 + 103 = 5871
Step 58: 5871 + 103 = 5974
Step 59: 5974 + 103 = 6077
Step 60: 6077 + 103 = 6180
Step 61: 6180 + 103 = 6283
Step 62: 6283 + 103 = 6386
Step 63: 6386 + 103 = 6489
Step 64: 6489 + 103 = 6592
Step 65: 6592 + 103 = 6695
Step 66: 6695 + 103 = 6798
Step 67: 6798 + 103 = 6901
Step 68: 6901 + 103 = 7004
Step 69: 7004 + 103 = 7107
Step 70: 7107 + 103 = 7210
Step 71: 7210 + 103 = 7313
Step 72: 7313 + 103 = 7416
Step 73: 7416 + 103 = 7519
Step 74: 7519 + 103 = 7622
Step 75: 7622 + 103 = 7725
Step 76: 7725 + 103 = 7828
Step 77: 7828 + 103 = 7931
Step 78: 7931 + 103 = 8034
Step 79: 8034 + 103 = 8137
Step 80: 8137 + 103 = 8240
Step 81: 8240 + 103 = 8343
Step 82: 8343 + 103 = 8446
Step 83: 8446 + 103 = 8549
Step 84: 8549 + 103 = 8652
Step 85: 8652 + 103 = 8755
Step 86: 8755 + 103 = 8858
Step 87: 8858 + 103 = 8961
Step 88: 8961 + 103 = 9064
Step 89: 9064 + 103 = 9167
Step 90: 9167 + 103 = 9270
Step 91: 9270 + 103 = 9373
Step 92: 9373 + 103 = 9476
Step 93: 9476 + 103 = 9579
Step 94: 9579 + 103 = 9682
Step 95: 9682 + 103 = 9785
Step 96: 9785 + 103 = 9888
Step 97: 9888 + 103 = 9991
Step 98: 9991 + 103 = 10094
Step 99: 10094 + 103 = 10197
Step 100: 10197 + 103 = 10300
Step 101: 10300 + 103 = 10403
Step 102: 10403 + 103 = 10506
Step 103: 10506 + 103 = 10609
Step 104: 10609 + 103 = 10712
Step 105: 10712 + 103 = 10815
Step 106: 10815 + 103 = 10918
Step 107: 10918 + 103 = 11021
Step 108: 11021 + 103 = 11124
Step 109: 11124 + 103 = 11227
Step 110: 11227 + 103 = 11330
Step 111: 11330 + 103 = 11433
Step 112: 11433 + 103 = 11536
Step 113: 11536 + 103 = 11639
Step 114: 11639 + 103 = 11742
Step 115: 11742 + 103 = 11845
Step 116: 11845 + 103 = 11948
Step 117: 11948 + 103 = 12051
Step 118: 12051 + 103 = 12154
Step 119: 12154 + 103 = 12257
Step 120: 12257 + 103 = 12360
Step 121: 12360 + 103 = 12463
Step 122: 12463 + 103 = 12566
Step 123: 12566 + 103 = 12669
Step 124: 12669 + 103 = 12772
Step 125: 12772 + 103 = 12875
Step 126: 12875 + 103 = 12978
Step 127: 12978 + 103 = 13081
Step 128: 13081 + 103 = 13184
Step 129: 13184 + 103 = 13287
Step 130: 13287 + 103 = 13390
Step 131: 13390 + 103 = 13493
Step 132: 13493 + 103 = 13596
Step 133: 13596 + 103 = 13699
Step 134: 13699 + 103 = 13802
Step 135: 13802 + 103 = 13905
Step 136: 13905 + 103 = 14008
Step 137: 14008 + 103 = 14111
Step 138: 14111 + 103 = 14214
Step 139: 14214 + 103 = 14317

So, 103*139 = 14317