OK, let's crack this. We're given 85 and our task is to multiply it by 128. Essentially, we'll be adding 85 to itself 128 times.
Step 1: 0 + 85 = 85
Step 2: 85 + 85 = 170
Step 3: 170 + 85 = 255
Step 4: 255 + 85 = 340
Step 5: 340 + 85 = 425
Step 6: 425 + 85 = 510
Step 7: 510 + 85 = 595
Step 8: 595 + 85 = 680
Step 9: 680 + 85 = 765
Step 10: 765 + 85 = 850
Step 11: 850 + 85 = 935
Step 12: 935 + 85 = 1020
Step 13: 1020 + 85 = 1105
Step 14: 1105 + 85 = 1190
Step 15: 1190 + 85 = 1275
Step 16: 1275 + 85 = 1360
Step 17: 1360 + 85 = 1445
Step 18: 1445 + 85 = 1530
Step 19: 1530 + 85 = 1615
Step 20: 1615 + 85 = 1700
Step 21: 1700 + 85 = 1785
Step 22: 1785 + 85 = 1870
Step 23: 1870 + 85 = 1955
Step 24: 1955 + 85 = 2040
Step 25: 2040 + 85 = 2125
Step 26: 2125 + 85 = 2210
Step 27: 2210 + 85 = 2295
Step 28: 2295 + 85 = 2380
Step 29: 2380 + 85 = 2465
Step 30: 2465 + 85 = 2550
Step 31: 2550 + 85 = 2635
Step 32: 2635 + 85 = 2720
Step 33: 2720 + 85 = 2805
Step 34: 2805 + 85 = 2890
Step 35: 2890 + 85 = 2975
Step 36: 2975 + 85 = 3060
Step 37: 3060 + 85 = 3145
Step 38: 3145 + 85 = 3230
Step 39: 3230 + 85 = 3315
Step 40: 3315 + 85 = 3400
Step 41: 3400 + 85 = 3485
Step 42: 3485 + 85 = 3570
Step 43: 3570 + 85 = 3655
Step 44: 3655 + 85 = 3740
Step 45: 3740 + 85 = 3825
Step 46: 3825 + 85 = 3910
Step 47: 3910 + 85 = 3995
Step 48: 3995 + 85 = 4080
Step 49: 4080 + 85 = 4165
Step 50: 4165 + 85 = 4250
Step 51: 4250 + 85 = 4335
Step 52: 4335 + 85 = 4420
Step 53: 4420 + 85 = 4505
Step 54: 4505 + 85 = 4590
Step 55: 4590 + 85 = 4675
Step 56: 4675 + 85 = 4760
Step 57: 4760 + 85 = 4845
Step 58: 4845 + 85 = 4930
Step 59: 4930 + 85 = 5015
Step 60: 5015 + 85 = 5100
Step 61: 5100 + 85 = 5185
Step 62: 5185 + 85 = 5270
Step 63: 5270 + 85 = 5355
Step 64: 5355 + 85 = 5440
Step 65: 5440 + 85 = 5525
Step 66: 5525 + 85 = 5610
Step 67: 5610 + 85 = 5695
Step 68: 5695 + 85 = 5780
Step 69: 5780 + 85 = 5865
Step 70: 5865 + 85 = 5950
Step 71: 5950 + 85 = 6035
Step 72: 6035 + 85 = 6120
Step 73: 6120 + 85 = 6205
Step 74: 6205 + 85 = 6290
Step 75: 6290 + 85 = 6375
Step 76: 6375 + 85 = 6460
Step 77: 6460 + 85 = 6545
Step 78: 6545 + 85 = 6630
Step 79: 6630 + 85 = 6715
Step 80: 6715 + 85 = 6800
Step 81: 6800 + 85 = 6885
Step 82: 6885 + 85 = 6970
Step 83: 6970 + 85 = 7055
Step 84: 7055 + 85 = 7140
Step 85: 7140 + 85 = 7225
Step 86: 7225 + 85 = 7310
Step 87: 7310 + 85 = 7395
Step 88: 7395 + 85 = 7480
Step 89: 7480 + 85 = 7565
Step 90: 7565 + 85 = 7650
Step 91: 7650 + 85 = 7735
Step 92: 7735 + 85 = 7820
Step 93: 7820 + 85 = 7905
Step 94: 7905 + 85 = 7990
Step 95: 7990 + 85 = 8075
Step 96: 8075 + 85 = 8160
Step 97: 8160 + 85 = 8245
Step 98: 8245 + 85 = 8330
Step 99: 8330 + 85 = 8415
Step 100: 8415 + 85 = 8500
Step 101: 8500 + 85 = 8585
Step 102: 8585 + 85 = 8670
Step 103: 8670 + 85 = 8755
Step 104: 8755 + 85 = 8840
Step 105: 8840 + 85 = 8925
Step 106: 8925 + 85 = 9010
Step 107: 9010 + 85 = 9095
Step 108: 9095 + 85 = 9180
Step 109: 9180 + 85 = 9265
Step 110: 9265 + 85 = 9350
Step 111: 9350 + 85 = 9435
Step 112: 9435 + 85 = 9520
Step 113: 9520 + 85 = 9605
Step 114: 9605 + 85 = 9690
Step 115: 9690 + 85 = 9775
Step 116: 9775 + 85 = 9860
Step 117: 9860 + 85 = 9945
Step 118: 9945 + 85 = 10030
Step 119: 10030 + 85 = 10115
Step 120: 10115 + 85 = 10200
Step 121: 10200 + 85 = 10285
Step 122: 10285 + 85 = 10370
Step 123: 10370 + 85 = 10455
Step 124: 10455 + 85 = 10540
Step 125: 10540 + 85 = 10625
Step 126: 10625 + 85 = 10710
Step 127: 10710 + 85 = 10795
Step 128: 10795 + 85 = 10880

So, 85*128 = 10880