Alright, let's solve this math problem step by step. First, we have the number 139. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 108. So, we're going to take the number 139 and add it to itself 108 times.
Step 1: 0 + 139 = 139
Step 2: 139 + 139 = 278
Step 3: 278 + 139 = 417
Step 4: 417 + 139 = 556
Step 5: 556 + 139 = 695
Step 6: 695 + 139 = 834
Step 7: 834 + 139 = 973
Step 8: 973 + 139 = 1112
Step 9: 1112 + 139 = 1251
Step 10: 1251 + 139 = 1390
Step 11: 1390 + 139 = 1529
Step 12: 1529 + 139 = 1668
Step 13: 1668 + 139 = 1807
Step 14: 1807 + 139 = 1946
Step 15: 1946 + 139 = 2085
Step 16: 2085 + 139 = 2224
Step 17: 2224 + 139 = 2363
Step 18: 2363 + 139 = 2502
Step 19: 2502 + 139 = 2641
Step 20: 2641 + 139 = 2780
Step 21: 2780 + 139 = 2919
Step 22: 2919 + 139 = 3058
Step 23: 3058 + 139 = 3197
Step 24: 3197 + 139 = 3336
Step 25: 3336 + 139 = 3475
Step 26: 3475 + 139 = 3614
Step 27: 3614 + 139 = 3753
Step 28: 3753 + 139 = 3892
Step 29: 3892 + 139 = 4031
Step 30: 4031 + 139 = 4170
Step 31: 4170 + 139 = 4309
Step 32: 4309 + 139 = 4448
Step 33: 4448 + 139 = 4587
Step 34: 4587 + 139 = 4726
Step 35: 4726 + 139 = 4865
Step 36: 4865 + 139 = 5004
Step 37: 5004 + 139 = 5143
Step 38: 5143 + 139 = 5282
Step 39: 5282 + 139 = 5421
Step 40: 5421 + 139 = 5560
Step 41: 5560 + 139 = 5699
Step 42: 5699 + 139 = 5838
Step 43: 5838 + 139 = 5977
Step 44: 5977 + 139 = 6116
Step 45: 6116 + 139 = 6255
Step 46: 6255 + 139 = 6394
Step 47: 6394 + 139 = 6533
Step 48: 6533 + 139 = 6672
Step 49: 6672 + 139 = 6811
Step 50: 6811 + 139 = 6950
Step 51: 6950 + 139 = 7089
Step 52: 7089 + 139 = 7228
Step 53: 7228 + 139 = 7367
Step 54: 7367 + 139 = 7506
Step 55: 7506 + 139 = 7645
Step 56: 7645 + 139 = 7784
Step 57: 7784 + 139 = 7923
Step 58: 7923 + 139 = 8062
Step 59: 8062 + 139 = 8201
Step 60: 8201 + 139 = 8340
Step 61: 8340 + 139 = 8479
Step 62: 8479 + 139 = 8618
Step 63: 8618 + 139 = 8757
Step 64: 8757 + 139 = 8896
Step 65: 8896 + 139 = 9035
Step 66: 9035 + 139 = 9174
Step 67: 9174 + 139 = 9313
Step 68: 9313 + 139 = 9452
Step 69: 9452 + 139 = 9591
Step 70: 9591 + 139 = 9730
Step 71: 9730 + 139 = 9869
Step 72: 9869 + 139 = 10008
Step 73: 10008 + 139 = 10147
Step 74: 10147 + 139 = 10286
Step 75: 10286 + 139 = 10425
Step 76: 10425 + 139 = 10564
Step 77: 10564 + 139 = 10703
Step 78: 10703 + 139 = 10842
Step 79: 10842 + 139 = 10981
Step 80: 10981 + 139 = 11120
Step 81: 11120 + 139 = 11259
Step 82: 11259 + 139 = 11398
Step 83: 11398 + 139 = 11537
Step 84: 11537 + 139 = 11676
Step 85: 11676 + 139 = 11815
Step 86: 11815 + 139 = 11954
Step 87: 11954 + 139 = 12093
Step 88: 12093 + 139 = 12232
Step 89: 12232 + 139 = 12371
Step 90: 12371 + 139 = 12510
Step 91: 12510 + 139 = 12649
Step 92: 12649 + 139 = 12788
Step 93: 12788 + 139 = 12927
Step 94: 12927 + 139 = 13066
Step 95: 13066 + 139 = 13205
Step 96: 13205 + 139 = 13344
Step 97: 13344 + 139 = 13483
Step 98: 13483 + 139 = 13622
Step 99: 13622 + 139 = 13761
Step 100: 13761 + 139 = 13900
Step 101: 13900 + 139 = 14039
Step 102: 14039 + 139 = 14178
Step 103: 14178 + 139 = 14317
Step 104: 14317 + 139 = 14456
Step 105: 14456 + 139 = 14595
Step 106: 14595 + 139 = 14734
Step 107: 14734 + 139 = 14873
Step 108: 14873 + 139 = 15012

So, 139*108 = 15012