OK, let's work through this together. We're starting with 755 and we're going to multiply it by 142, which means we add 755 to itself 142 times.
Step 1: 0 + 755 = 755
Step 2: 755 + 755 = 1510
Step 3: 1510 + 755 = 2265
Step 4: 2265 + 755 = 3020
Step 5: 3020 + 755 = 3775
Step 6: 3775 + 755 = 4530
Step 7: 4530 + 755 = 5285
Step 8: 5285 + 755 = 6040
Step 9: 6040 + 755 = 6795
Step 10: 6795 + 755 = 7550
Step 11: 7550 + 755 = 8305
Step 12: 8305 + 755 = 9060
Step 13: 9060 + 755 = 9815
Step 14: 9815 + 755 = 10570
Step 15: 10570 + 755 = 11325
Step 16: 11325 + 755 = 12080
Step 17: 12080 + 755 = 12835
Step 18: 12835 + 755 = 13590
Step 19: 13590 + 755 = 14345
Step 20: 14345 + 755 = 15100
Step 21: 15100 + 755 = 15855
Step 22: 15855 + 755 = 16610
Step 23: 16610 + 755 = 17365
Step 24: 17365 + 755 = 18120
Step 25: 18120 + 755 = 18875
Step 26: 18875 + 755 = 19630
Step 27: 19630 + 755 = 20385
Step 28: 20385 + 755 = 21140
Step 29: 21140 + 755 = 21895
Step 30: 21895 + 755 = 22650
Step 31: 22650 + 755 = 23405
Step 32: 23405 + 755 = 24160
Step 33: 24160 + 755 = 24915
Step 34: 24915 + 755 = 25670
Step 35: 25670 + 755 = 26425
Step 36: 26425 + 755 = 27180
Step 37: 27180 + 755 = 27935
Step 38: 27935 + 755 = 28690
Step 39: 28690 + 755 = 29445
Step 40: 29445 + 755 = 30200
Step 41: 30200 + 755 = 30955
Step 42: 30955 + 755 = 31710
Step 43: 31710 + 755 = 32465
Step 44: 32465 + 755 = 33220
Step 45: 33220 + 755 = 33975
Step 46: 33975 + 755 = 34730
Step 47: 34730 + 755 = 35485
Step 48: 35485 + 755 = 36240
Step 49: 36240 + 755 = 36995
Step 50: 36995 + 755 = 37750
Step 51: 37750 + 755 = 38505
Step 52: 38505 + 755 = 39260
Step 53: 39260 + 755 = 40015
Step 54: 40015 + 755 = 40770
Step 55: 40770 + 755 = 41525
Step 56: 41525 + 755 = 42280
Step 57: 42280 + 755 = 43035
Step 58: 43035 + 755 = 43790
Step 59: 43790 + 755 = 44545
Step 60: 44545 + 755 = 45300
Step 61: 45300 + 755 = 46055
Step 62: 46055 + 755 = 46810
Step 63: 46810 + 755 = 47565
Step 64: 47565 + 755 = 48320
Step 65: 48320 + 755 = 49075
Step 66: 49075 + 755 = 49830
Step 67: 49830 + 755 = 50585
Step 68: 50585 + 755 = 51340
Step 69: 51340 + 755 = 52095
Step 70: 52095 + 755 = 52850
Step 71: 52850 + 755 = 53605
Step 72: 53605 + 755 = 54360
Step 73: 54360 + 755 = 55115
Step 74: 55115 + 755 = 55870
Step 75: 55870 + 755 = 56625
Step 76: 56625 + 755 = 57380
Step 77: 57380 + 755 = 58135
Step 78: 58135 + 755 = 58890
Step 79: 58890 + 755 = 59645
Step 80: 59645 + 755 = 60400
Step 81: 60400 + 755 = 61155
Step 82: 61155 + 755 = 61910
Step 83: 61910 + 755 = 62665
Step 84: 62665 + 755 = 63420
Step 85: 63420 + 755 = 64175
Step 86: 64175 + 755 = 64930
Step 87: 64930 + 755 = 65685
Step 88: 65685 + 755 = 66440
Step 89: 66440 + 755 = 67195
Step 90: 67195 + 755 = 67950
Step 91: 67950 + 755 = 68705
Step 92: 68705 + 755 = 69460
Step 93: 69460 + 755 = 70215
Step 94: 70215 + 755 = 70970
Step 95: 70970 + 755 = 71725
Step 96: 71725 + 755 = 72480
Step 97: 72480 + 755 = 73235
Step 98: 73235 + 755 = 73990
Step 99: 73990 + 755 = 74745
Step 100: 74745 + 755 = 75500
Step 101: 75500 + 755 = 76255
Step 102: 76255 + 755 = 77010
Step 103: 77010 + 755 = 77765
Step 104: 77765 + 755 = 78520
Step 105: 78520 + 755 = 79275
Step 106: 79275 + 755 = 80030
Step 107: 80030 + 755 = 80785
Step 108: 80785 + 755 = 81540
Step 109: 81540 + 755 = 82295
Step 110: 82295 + 755 = 83050
Step 111: 83050 + 755 = 83805
Step 112: 83805 + 755 = 84560
Step 113: 84560 + 755 = 85315
Step 114: 85315 + 755 = 86070
Step 115: 86070 + 755 = 86825
Step 116: 86825 + 755 = 87580
Step 117: 87580 + 755 = 88335
Step 118: 88335 + 755 = 89090
Step 119: 89090 + 755 = 89845
Step 120: 89845 + 755 = 90600
Step 121: 90600 + 755 = 91355
Step 122: 91355 + 755 = 92110
Step 123: 92110 + 755 = 92865
Step 124: 92865 + 755 = 93620
Step 125: 93620 + 755 = 94375
Step 126: 94375 + 755 = 95130
Step 127: 95130 + 755 = 95885
Step 128: 95885 + 755 = 96640
Step 129: 96640 + 755 = 97395
Step 130: 97395 + 755 = 98150
Step 131: 98150 + 755 = 98905
Step 132: 98905 + 755 = 99660
Step 133: 99660 + 755 = 100415
Step 134: 100415 + 755 = 101170
Step 135: 101170 + 755 = 101925
Step 136: 101925 + 755 = 102680
Step 137: 102680 + 755 = 103435
Step 138: 103435 + 755 = 104190
Step 139: 104190 + 755 = 104945
Step 140: 104945 + 755 = 105700
Step 141: 105700 + 755 = 106455
Step 142: 106455 + 755 = 107210

So, 755*142 = 107210