Let's roll up our sleeves and solve this. We have 540 and we're going to multiply it by 143, essentially adding 540 to itself 143 times.
Step 1: 0 + 540 = 540
Step 2: 540 + 540 = 1080
Step 3: 1080 + 540 = 1620
Step 4: 1620 + 540 = 2160
Step 5: 2160 + 540 = 2700
Step 6: 2700 + 540 = 3240
Step 7: 3240 + 540 = 3780
Step 8: 3780 + 540 = 4320
Step 9: 4320 + 540 = 4860
Step 10: 4860 + 540 = 5400
Step 11: 5400 + 540 = 5940
Step 12: 5940 + 540 = 6480
Step 13: 6480 + 540 = 7020
Step 14: 7020 + 540 = 7560
Step 15: 7560 + 540 = 8100
Step 16: 8100 + 540 = 8640
Step 17: 8640 + 540 = 9180
Step 18: 9180 + 540 = 9720
Step 19: 9720 + 540 = 10260
Step 20: 10260 + 540 = 10800
Step 21: 10800 + 540 = 11340
Step 22: 11340 + 540 = 11880
Step 23: 11880 + 540 = 12420
Step 24: 12420 + 540 = 12960
Step 25: 12960 + 540 = 13500
Step 26: 13500 + 540 = 14040
Step 27: 14040 + 540 = 14580
Step 28: 14580 + 540 = 15120
Step 29: 15120 + 540 = 15660
Step 30: 15660 + 540 = 16200
Step 31: 16200 + 540 = 16740
Step 32: 16740 + 540 = 17280
Step 33: 17280 + 540 = 17820
Step 34: 17820 + 540 = 18360
Step 35: 18360 + 540 = 18900
Step 36: 18900 + 540 = 19440
Step 37: 19440 + 540 = 19980
Step 38: 19980 + 540 = 20520
Step 39: 20520 + 540 = 21060
Step 40: 21060 + 540 = 21600
Step 41: 21600 + 540 = 22140
Step 42: 22140 + 540 = 22680
Step 43: 22680 + 540 = 23220
Step 44: 23220 + 540 = 23760
Step 45: 23760 + 540 = 24300
Step 46: 24300 + 540 = 24840
Step 47: 24840 + 540 = 25380
Step 48: 25380 + 540 = 25920
Step 49: 25920 + 540 = 26460
Step 50: 26460 + 540 = 27000
Step 51: 27000 + 540 = 27540
Step 52: 27540 + 540 = 28080
Step 53: 28080 + 540 = 28620
Step 54: 28620 + 540 = 29160
Step 55: 29160 + 540 = 29700
Step 56: 29700 + 540 = 30240
Step 57: 30240 + 540 = 30780
Step 58: 30780 + 540 = 31320
Step 59: 31320 + 540 = 31860
Step 60: 31860 + 540 = 32400
Step 61: 32400 + 540 = 32940
Step 62: 32940 + 540 = 33480
Step 63: 33480 + 540 = 34020
Step 64: 34020 + 540 = 34560
Step 65: 34560 + 540 = 35100
Step 66: 35100 + 540 = 35640
Step 67: 35640 + 540 = 36180
Step 68: 36180 + 540 = 36720
Step 69: 36720 + 540 = 37260
Step 70: 37260 + 540 = 37800
Step 71: 37800 + 540 = 38340
Step 72: 38340 + 540 = 38880
Step 73: 38880 + 540 = 39420
Step 74: 39420 + 540 = 39960
Step 75: 39960 + 540 = 40500
Step 76: 40500 + 540 = 41040
Step 77: 41040 + 540 = 41580
Step 78: 41580 + 540 = 42120
Step 79: 42120 + 540 = 42660
Step 80: 42660 + 540 = 43200
Step 81: 43200 + 540 = 43740
Step 82: 43740 + 540 = 44280
Step 83: 44280 + 540 = 44820
Step 84: 44820 + 540 = 45360
Step 85: 45360 + 540 = 45900
Step 86: 45900 + 540 = 46440
Step 87: 46440 + 540 = 46980
Step 88: 46980 + 540 = 47520
Step 89: 47520 + 540 = 48060
Step 90: 48060 + 540 = 48600
Step 91: 48600 + 540 = 49140
Step 92: 49140 + 540 = 49680
Step 93: 49680 + 540 = 50220
Step 94: 50220 + 540 = 50760
Step 95: 50760 + 540 = 51300
Step 96: 51300 + 540 = 51840
Step 97: 51840 + 540 = 52380
Step 98: 52380 + 540 = 52920
Step 99: 52920 + 540 = 53460
Step 100: 53460 + 540 = 54000
Step 101: 54000 + 540 = 54540
Step 102: 54540 + 540 = 55080
Step 103: 55080 + 540 = 55620
Step 104: 55620 + 540 = 56160
Step 105: 56160 + 540 = 56700
Step 106: 56700 + 540 = 57240
Step 107: 57240 + 540 = 57780
Step 108: 57780 + 540 = 58320
Step 109: 58320 + 540 = 58860
Step 110: 58860 + 540 = 59400
Step 111: 59400 + 540 = 59940
Step 112: 59940 + 540 = 60480
Step 113: 60480 + 540 = 61020
Step 114: 61020 + 540 = 61560
Step 115: 61560 + 540 = 62100
Step 116: 62100 + 540 = 62640
Step 117: 62640 + 540 = 63180
Step 118: 63180 + 540 = 63720
Step 119: 63720 + 540 = 64260
Step 120: 64260 + 540 = 64800
Step 121: 64800 + 540 = 65340
Step 122: 65340 + 540 = 65880
Step 123: 65880 + 540 = 66420
Step 124: 66420 + 540 = 66960
Step 125: 66960 + 540 = 67500
Step 126: 67500 + 540 = 68040
Step 127: 68040 + 540 = 68580
Step 128: 68580 + 540 = 69120
Step 129: 69120 + 540 = 69660
Step 130: 69660 + 540 = 70200
Step 131: 70200 + 540 = 70740
Step 132: 70740 + 540 = 71280
Step 133: 71280 + 540 = 71820
Step 134: 71820 + 540 = 72360
Step 135: 72360 + 540 = 72900
Step 136: 72900 + 540 = 73440
Step 137: 73440 + 540 = 73980
Step 138: 73980 + 540 = 74520
Step 139: 74520 + 540 = 75060
Step 140: 75060 + 540 = 75600
Step 141: 75600 + 540 = 76140
Step 142: 76140 + 540 = 76680
Step 143: 76680 + 540 = 77220

So, 540*143 = 77220