Sure thing! We've got 171 and we're gonna multiply it by 109. That's the same as adding 171 to itself 109 times.
Step 1: 0 + 171 = 171
Step 2: 171 + 171 = 342
Step 3: 342 + 171 = 513
Step 4: 513 + 171 = 684
Step 5: 684 + 171 = 855
Step 6: 855 + 171 = 1026
Step 7: 1026 + 171 = 1197
Step 8: 1197 + 171 = 1368
Step 9: 1368 + 171 = 1539
Step 10: 1539 + 171 = 1710
Step 11: 1710 + 171 = 1881
Step 12: 1881 + 171 = 2052
Step 13: 2052 + 171 = 2223
Step 14: 2223 + 171 = 2394
Step 15: 2394 + 171 = 2565
Step 16: 2565 + 171 = 2736
Step 17: 2736 + 171 = 2907
Step 18: 2907 + 171 = 3078
Step 19: 3078 + 171 = 3249
Step 20: 3249 + 171 = 3420
Step 21: 3420 + 171 = 3591
Step 22: 3591 + 171 = 3762
Step 23: 3762 + 171 = 3933
Step 24: 3933 + 171 = 4104
Step 25: 4104 + 171 = 4275
Step 26: 4275 + 171 = 4446
Step 27: 4446 + 171 = 4617
Step 28: 4617 + 171 = 4788
Step 29: 4788 + 171 = 4959
Step 30: 4959 + 171 = 5130
Step 31: 5130 + 171 = 5301
Step 32: 5301 + 171 = 5472
Step 33: 5472 + 171 = 5643
Step 34: 5643 + 171 = 5814
Step 35: 5814 + 171 = 5985
Step 36: 5985 + 171 = 6156
Step 37: 6156 + 171 = 6327
Step 38: 6327 + 171 = 6498
Step 39: 6498 + 171 = 6669
Step 40: 6669 + 171 = 6840
Step 41: 6840 + 171 = 7011
Step 42: 7011 + 171 = 7182
Step 43: 7182 + 171 = 7353
Step 44: 7353 + 171 = 7524
Step 45: 7524 + 171 = 7695
Step 46: 7695 + 171 = 7866
Step 47: 7866 + 171 = 8037
Step 48: 8037 + 171 = 8208
Step 49: 8208 + 171 = 8379
Step 50: 8379 + 171 = 8550
Step 51: 8550 + 171 = 8721
Step 52: 8721 + 171 = 8892
Step 53: 8892 + 171 = 9063
Step 54: 9063 + 171 = 9234
Step 55: 9234 + 171 = 9405
Step 56: 9405 + 171 = 9576
Step 57: 9576 + 171 = 9747
Step 58: 9747 + 171 = 9918
Step 59: 9918 + 171 = 10089
Step 60: 10089 + 171 = 10260
Step 61: 10260 + 171 = 10431
Step 62: 10431 + 171 = 10602
Step 63: 10602 + 171 = 10773
Step 64: 10773 + 171 = 10944
Step 65: 10944 + 171 = 11115
Step 66: 11115 + 171 = 11286
Step 67: 11286 + 171 = 11457
Step 68: 11457 + 171 = 11628
Step 69: 11628 + 171 = 11799
Step 70: 11799 + 171 = 11970
Step 71: 11970 + 171 = 12141
Step 72: 12141 + 171 = 12312
Step 73: 12312 + 171 = 12483
Step 74: 12483 + 171 = 12654
Step 75: 12654 + 171 = 12825
Step 76: 12825 + 171 = 12996
Step 77: 12996 + 171 = 13167
Step 78: 13167 + 171 = 13338
Step 79: 13338 + 171 = 13509
Step 80: 13509 + 171 = 13680
Step 81: 13680 + 171 = 13851
Step 82: 13851 + 171 = 14022
Step 83: 14022 + 171 = 14193
Step 84: 14193 + 171 = 14364
Step 85: 14364 + 171 = 14535
Step 86: 14535 + 171 = 14706
Step 87: 14706 + 171 = 14877
Step 88: 14877 + 171 = 15048
Step 89: 15048 + 171 = 15219
Step 90: 15219 + 171 = 15390
Step 91: 15390 + 171 = 15561
Step 92: 15561 + 171 = 15732
Step 93: 15732 + 171 = 15903
Step 94: 15903 + 171 = 16074
Step 95: 16074 + 171 = 16245
Step 96: 16245 + 171 = 16416
Step 97: 16416 + 171 = 16587
Step 98: 16587 + 171 = 16758
Step 99: 16758 + 171 = 16929
Step 100: 16929 + 171 = 17100
Step 101: 17100 + 171 = 17271
Step 102: 17271 + 171 = 17442
Step 103: 17442 + 171 = 17613
Step 104: 17613 + 171 = 17784
Step 105: 17784 + 171 = 17955
Step 106: 17955 + 171 = 18126
Step 107: 18126 + 171 = 18297
Step 108: 18297 + 171 = 18468
Step 109: 18468 + 171 = 18639

So, 171*109 = 18639