Let's roll up our sleeves and solve this. We have 705 and we're going to multiply it by 143, essentially adding 705 to itself 143 times.
Step 1: 0 + 705 = 705
Step 2: 705 + 705 = 1410
Step 3: 1410 + 705 = 2115
Step 4: 2115 + 705 = 2820
Step 5: 2820 + 705 = 3525
Step 6: 3525 + 705 = 4230
Step 7: 4230 + 705 = 4935
Step 8: 4935 + 705 = 5640
Step 9: 5640 + 705 = 6345
Step 10: 6345 + 705 = 7050
Step 11: 7050 + 705 = 7755
Step 12: 7755 + 705 = 8460
Step 13: 8460 + 705 = 9165
Step 14: 9165 + 705 = 9870
Step 15: 9870 + 705 = 10575
Step 16: 10575 + 705 = 11280
Step 17: 11280 + 705 = 11985
Step 18: 11985 + 705 = 12690
Step 19: 12690 + 705 = 13395
Step 20: 13395 + 705 = 14100
Step 21: 14100 + 705 = 14805
Step 22: 14805 + 705 = 15510
Step 23: 15510 + 705 = 16215
Step 24: 16215 + 705 = 16920
Step 25: 16920 + 705 = 17625
Step 26: 17625 + 705 = 18330
Step 27: 18330 + 705 = 19035
Step 28: 19035 + 705 = 19740
Step 29: 19740 + 705 = 20445
Step 30: 20445 + 705 = 21150
Step 31: 21150 + 705 = 21855
Step 32: 21855 + 705 = 22560
Step 33: 22560 + 705 = 23265
Step 34: 23265 + 705 = 23970
Step 35: 23970 + 705 = 24675
Step 36: 24675 + 705 = 25380
Step 37: 25380 + 705 = 26085
Step 38: 26085 + 705 = 26790
Step 39: 26790 + 705 = 27495
Step 40: 27495 + 705 = 28200
Step 41: 28200 + 705 = 28905
Step 42: 28905 + 705 = 29610
Step 43: 29610 + 705 = 30315
Step 44: 30315 + 705 = 31020
Step 45: 31020 + 705 = 31725
Step 46: 31725 + 705 = 32430
Step 47: 32430 + 705 = 33135
Step 48: 33135 + 705 = 33840
Step 49: 33840 + 705 = 34545
Step 50: 34545 + 705 = 35250
Step 51: 35250 + 705 = 35955
Step 52: 35955 + 705 = 36660
Step 53: 36660 + 705 = 37365
Step 54: 37365 + 705 = 38070
Step 55: 38070 + 705 = 38775
Step 56: 38775 + 705 = 39480
Step 57: 39480 + 705 = 40185
Step 58: 40185 + 705 = 40890
Step 59: 40890 + 705 = 41595
Step 60: 41595 + 705 = 42300
Step 61: 42300 + 705 = 43005
Step 62: 43005 + 705 = 43710
Step 63: 43710 + 705 = 44415
Step 64: 44415 + 705 = 45120
Step 65: 45120 + 705 = 45825
Step 66: 45825 + 705 = 46530
Step 67: 46530 + 705 = 47235
Step 68: 47235 + 705 = 47940
Step 69: 47940 + 705 = 48645
Step 70: 48645 + 705 = 49350
Step 71: 49350 + 705 = 50055
Step 72: 50055 + 705 = 50760
Step 73: 50760 + 705 = 51465
Step 74: 51465 + 705 = 52170
Step 75: 52170 + 705 = 52875
Step 76: 52875 + 705 = 53580
Step 77: 53580 + 705 = 54285
Step 78: 54285 + 705 = 54990
Step 79: 54990 + 705 = 55695
Step 80: 55695 + 705 = 56400
Step 81: 56400 + 705 = 57105
Step 82: 57105 + 705 = 57810
Step 83: 57810 + 705 = 58515
Step 84: 58515 + 705 = 59220
Step 85: 59220 + 705 = 59925
Step 86: 59925 + 705 = 60630
Step 87: 60630 + 705 = 61335
Step 88: 61335 + 705 = 62040
Step 89: 62040 + 705 = 62745
Step 90: 62745 + 705 = 63450
Step 91: 63450 + 705 = 64155
Step 92: 64155 + 705 = 64860
Step 93: 64860 + 705 = 65565
Step 94: 65565 + 705 = 66270
Step 95: 66270 + 705 = 66975
Step 96: 66975 + 705 = 67680
Step 97: 67680 + 705 = 68385
Step 98: 68385 + 705 = 69090
Step 99: 69090 + 705 = 69795
Step 100: 69795 + 705 = 70500
Step 101: 70500 + 705 = 71205
Step 102: 71205 + 705 = 71910
Step 103: 71910 + 705 = 72615
Step 104: 72615 + 705 = 73320
Step 105: 73320 + 705 = 74025
Step 106: 74025 + 705 = 74730
Step 107: 74730 + 705 = 75435
Step 108: 75435 + 705 = 76140
Step 109: 76140 + 705 = 76845
Step 110: 76845 + 705 = 77550
Step 111: 77550 + 705 = 78255
Step 112: 78255 + 705 = 78960
Step 113: 78960 + 705 = 79665
Step 114: 79665 + 705 = 80370
Step 115: 80370 + 705 = 81075
Step 116: 81075 + 705 = 81780
Step 117: 81780 + 705 = 82485
Step 118: 82485 + 705 = 83190
Step 119: 83190 + 705 = 83895
Step 120: 83895 + 705 = 84600
Step 121: 84600 + 705 = 85305
Step 122: 85305 + 705 = 86010
Step 123: 86010 + 705 = 86715
Step 124: 86715 + 705 = 87420
Step 125: 87420 + 705 = 88125
Step 126: 88125 + 705 = 88830
Step 127: 88830 + 705 = 89535
Step 128: 89535 + 705 = 90240
Step 129: 90240 + 705 = 90945
Step 130: 90945 + 705 = 91650
Step 131: 91650 + 705 = 92355
Step 132: 92355 + 705 = 93060
Step 133: 93060 + 705 = 93765
Step 134: 93765 + 705 = 94470
Step 135: 94470 + 705 = 95175
Step 136: 95175 + 705 = 95880
Step 137: 95880 + 705 = 96585
Step 138: 96585 + 705 = 97290
Step 139: 97290 + 705 = 97995
Step 140: 97995 + 705 = 98700
Step 141: 98700 + 705 = 99405
Step 142: 99405 + 705 = 100110
Step 143: 100110 + 705 = 100815

So, 705*143 = 100815