Without delay, let's solve this. We've got 50 and we will be multiplying it by 140, that is, adding 50 to itself 140 times.
Step 1: 0 + 50 = 50
Step 2: 50 + 50 = 100
Step 3: 100 + 50 = 150
Step 4: 150 + 50 = 200
Step 5: 200 + 50 = 250
Step 6: 250 + 50 = 300
Step 7: 300 + 50 = 350
Step 8: 350 + 50 = 400
Step 9: 400 + 50 = 450
Step 10: 450 + 50 = 500
Step 11: 500 + 50 = 550
Step 12: 550 + 50 = 600
Step 13: 600 + 50 = 650
Step 14: 650 + 50 = 700
Step 15: 700 + 50 = 750
Step 16: 750 + 50 = 800
Step 17: 800 + 50 = 850
Step 18: 850 + 50 = 900
Step 19: 900 + 50 = 950
Step 20: 950 + 50 = 1000
Step 21: 1000 + 50 = 1050
Step 22: 1050 + 50 = 1100
Step 23: 1100 + 50 = 1150
Step 24: 1150 + 50 = 1200
Step 25: 1200 + 50 = 1250
Step 26: 1250 + 50 = 1300
Step 27: 1300 + 50 = 1350
Step 28: 1350 + 50 = 1400
Step 29: 1400 + 50 = 1450
Step 30: 1450 + 50 = 1500
Step 31: 1500 + 50 = 1550
Step 32: 1550 + 50 = 1600
Step 33: 1600 + 50 = 1650
Step 34: 1650 + 50 = 1700
Step 35: 1700 + 50 = 1750
Step 36: 1750 + 50 = 1800
Step 37: 1800 + 50 = 1850
Step 38: 1850 + 50 = 1900
Step 39: 1900 + 50 = 1950
Step 40: 1950 + 50 = 2000
Step 41: 2000 + 50 = 2050
Step 42: 2050 + 50 = 2100
Step 43: 2100 + 50 = 2150
Step 44: 2150 + 50 = 2200
Step 45: 2200 + 50 = 2250
Step 46: 2250 + 50 = 2300
Step 47: 2300 + 50 = 2350
Step 48: 2350 + 50 = 2400
Step 49: 2400 + 50 = 2450
Step 50: 2450 + 50 = 2500
Step 51: 2500 + 50 = 2550
Step 52: 2550 + 50 = 2600
Step 53: 2600 + 50 = 2650
Step 54: 2650 + 50 = 2700
Step 55: 2700 + 50 = 2750
Step 56: 2750 + 50 = 2800
Step 57: 2800 + 50 = 2850
Step 58: 2850 + 50 = 2900
Step 59: 2900 + 50 = 2950
Step 60: 2950 + 50 = 3000
Step 61: 3000 + 50 = 3050
Step 62: 3050 + 50 = 3100
Step 63: 3100 + 50 = 3150
Step 64: 3150 + 50 = 3200
Step 65: 3200 + 50 = 3250
Step 66: 3250 + 50 = 3300
Step 67: 3300 + 50 = 3350
Step 68: 3350 + 50 = 3400
Step 69: 3400 + 50 = 3450
Step 70: 3450 + 50 = 3500
Step 71: 3500 + 50 = 3550
Step 72: 3550 + 50 = 3600
Step 73: 3600 + 50 = 3650
Step 74: 3650 + 50 = 3700
Step 75: 3700 + 50 = 3750
Step 76: 3750 + 50 = 3800
Step 77: 3800 + 50 = 3850
Step 78: 3850 + 50 = 3900
Step 79: 3900 + 50 = 3950
Step 80: 3950 + 50 = 4000
Step 81: 4000 + 50 = 4050
Step 82: 4050 + 50 = 4100
Step 83: 4100 + 50 = 4150
Step 84: 4150 + 50 = 4200
Step 85: 4200 + 50 = 4250
Step 86: 4250 + 50 = 4300
Step 87: 4300 + 50 = 4350
Step 88: 4350 + 50 = 4400
Step 89: 4400 + 50 = 4450
Step 90: 4450 + 50 = 4500
Step 91: 4500 + 50 = 4550
Step 92: 4550 + 50 = 4600
Step 93: 4600 + 50 = 4650
Step 94: 4650 + 50 = 4700
Step 95: 4700 + 50 = 4750
Step 96: 4750 + 50 = 4800
Step 97: 4800 + 50 = 4850
Step 98: 4850 + 50 = 4900
Step 99: 4900 + 50 = 4950
Step 100: 4950 + 50 = 5000
Step 101: 5000 + 50 = 5050
Step 102: 5050 + 50 = 5100
Step 103: 5100 + 50 = 5150
Step 104: 5150 + 50 = 5200
Step 105: 5200 + 50 = 5250
Step 106: 5250 + 50 = 5300
Step 107: 5300 + 50 = 5350
Step 108: 5350 + 50 = 5400
Step 109: 5400 + 50 = 5450
Step 110: 5450 + 50 = 5500
Step 111: 5500 + 50 = 5550
Step 112: 5550 + 50 = 5600
Step 113: 5600 + 50 = 5650
Step 114: 5650 + 50 = 5700
Step 115: 5700 + 50 = 5750
Step 116: 5750 + 50 = 5800
Step 117: 5800 + 50 = 5850
Step 118: 5850 + 50 = 5900
Step 119: 5900 + 50 = 5950
Step 120: 5950 + 50 = 6000
Step 121: 6000 + 50 = 6050
Step 122: 6050 + 50 = 6100
Step 123: 6100 + 50 = 6150
Step 124: 6150 + 50 = 6200
Step 125: 6200 + 50 = 6250
Step 126: 6250 + 50 = 6300
Step 127: 6300 + 50 = 6350
Step 128: 6350 + 50 = 6400
Step 129: 6400 + 50 = 6450
Step 130: 6450 + 50 = 6500
Step 131: 6500 + 50 = 6550
Step 132: 6550 + 50 = 6600
Step 133: 6600 + 50 = 6650
Step 134: 6650 + 50 = 6700
Step 135: 6700 + 50 = 6750
Step 136: 6750 + 50 = 6800
Step 137: 6800 + 50 = 6850
Step 138: 6850 + 50 = 6900
Step 139: 6900 + 50 = 6950
Step 140: 6950 + 50 = 7000

So, 50*140 = 7000