Sure thing, let's get straight to it. We start with 159 and we're going to multiply it by 128, which means adding 159 to itself 128 times.
Step 1: 0 + 159 = 159
Step 2: 159 + 159 = 318
Step 3: 318 + 159 = 477
Step 4: 477 + 159 = 636
Step 5: 636 + 159 = 795
Step 6: 795 + 159 = 954
Step 7: 954 + 159 = 1113
Step 8: 1113 + 159 = 1272
Step 9: 1272 + 159 = 1431
Step 10: 1431 + 159 = 1590
Step 11: 1590 + 159 = 1749
Step 12: 1749 + 159 = 1908
Step 13: 1908 + 159 = 2067
Step 14: 2067 + 159 = 2226
Step 15: 2226 + 159 = 2385
Step 16: 2385 + 159 = 2544
Step 17: 2544 + 159 = 2703
Step 18: 2703 + 159 = 2862
Step 19: 2862 + 159 = 3021
Step 20: 3021 + 159 = 3180
Step 21: 3180 + 159 = 3339
Step 22: 3339 + 159 = 3498
Step 23: 3498 + 159 = 3657
Step 24: 3657 + 159 = 3816
Step 25: 3816 + 159 = 3975
Step 26: 3975 + 159 = 4134
Step 27: 4134 + 159 = 4293
Step 28: 4293 + 159 = 4452
Step 29: 4452 + 159 = 4611
Step 30: 4611 + 159 = 4770
Step 31: 4770 + 159 = 4929
Step 32: 4929 + 159 = 5088
Step 33: 5088 + 159 = 5247
Step 34: 5247 + 159 = 5406
Step 35: 5406 + 159 = 5565
Step 36: 5565 + 159 = 5724
Step 37: 5724 + 159 = 5883
Step 38: 5883 + 159 = 6042
Step 39: 6042 + 159 = 6201
Step 40: 6201 + 159 = 6360
Step 41: 6360 + 159 = 6519
Step 42: 6519 + 159 = 6678
Step 43: 6678 + 159 = 6837
Step 44: 6837 + 159 = 6996
Step 45: 6996 + 159 = 7155
Step 46: 7155 + 159 = 7314
Step 47: 7314 + 159 = 7473
Step 48: 7473 + 159 = 7632
Step 49: 7632 + 159 = 7791
Step 50: 7791 + 159 = 7950
Step 51: 7950 + 159 = 8109
Step 52: 8109 + 159 = 8268
Step 53: 8268 + 159 = 8427
Step 54: 8427 + 159 = 8586
Step 55: 8586 + 159 = 8745
Step 56: 8745 + 159 = 8904
Step 57: 8904 + 159 = 9063
Step 58: 9063 + 159 = 9222
Step 59: 9222 + 159 = 9381
Step 60: 9381 + 159 = 9540
Step 61: 9540 + 159 = 9699
Step 62: 9699 + 159 = 9858
Step 63: 9858 + 159 = 10017
Step 64: 10017 + 159 = 10176
Step 65: 10176 + 159 = 10335
Step 66: 10335 + 159 = 10494
Step 67: 10494 + 159 = 10653
Step 68: 10653 + 159 = 10812
Step 69: 10812 + 159 = 10971
Step 70: 10971 + 159 = 11130
Step 71: 11130 + 159 = 11289
Step 72: 11289 + 159 = 11448
Step 73: 11448 + 159 = 11607
Step 74: 11607 + 159 = 11766
Step 75: 11766 + 159 = 11925
Step 76: 11925 + 159 = 12084
Step 77: 12084 + 159 = 12243
Step 78: 12243 + 159 = 12402
Step 79: 12402 + 159 = 12561
Step 80: 12561 + 159 = 12720
Step 81: 12720 + 159 = 12879
Step 82: 12879 + 159 = 13038
Step 83: 13038 + 159 = 13197
Step 84: 13197 + 159 = 13356
Step 85: 13356 + 159 = 13515
Step 86: 13515 + 159 = 13674
Step 87: 13674 + 159 = 13833
Step 88: 13833 + 159 = 13992
Step 89: 13992 + 159 = 14151
Step 90: 14151 + 159 = 14310
Step 91: 14310 + 159 = 14469
Step 92: 14469 + 159 = 14628
Step 93: 14628 + 159 = 14787
Step 94: 14787 + 159 = 14946
Step 95: 14946 + 159 = 15105
Step 96: 15105 + 159 = 15264
Step 97: 15264 + 159 = 15423
Step 98: 15423 + 159 = 15582
Step 99: 15582 + 159 = 15741
Step 100: 15741 + 159 = 15900
Step 101: 15900 + 159 = 16059
Step 102: 16059 + 159 = 16218
Step 103: 16218 + 159 = 16377
Step 104: 16377 + 159 = 16536
Step 105: 16536 + 159 = 16695
Step 106: 16695 + 159 = 16854
Step 107: 16854 + 159 = 17013
Step 108: 17013 + 159 = 17172
Step 109: 17172 + 159 = 17331
Step 110: 17331 + 159 = 17490
Step 111: 17490 + 159 = 17649
Step 112: 17649 + 159 = 17808
Step 113: 17808 + 159 = 17967
Step 114: 17967 + 159 = 18126
Step 115: 18126 + 159 = 18285
Step 116: 18285 + 159 = 18444
Step 117: 18444 + 159 = 18603
Step 118: 18603 + 159 = 18762
Step 119: 18762 + 159 = 18921
Step 120: 18921 + 159 = 19080
Step 121: 19080 + 159 = 19239
Step 122: 19239 + 159 = 19398
Step 123: 19398 + 159 = 19557
Step 124: 19557 + 159 = 19716
Step 125: 19716 + 159 = 19875
Step 126: 19875 + 159 = 20034
Step 127: 20034 + 159 = 20193
Step 128: 20193 + 159 = 20352

So, 159*128 = 20352