Without delay, let's solve this. We've got 150 and we will be multiplying it by 131, that is, adding 150 to itself 131 times.
Step 1: 0 + 150 = 150
Step 2: 150 + 150 = 300
Step 3: 300 + 150 = 450
Step 4: 450 + 150 = 600
Step 5: 600 + 150 = 750
Step 6: 750 + 150 = 900
Step 7: 900 + 150 = 1050
Step 8: 1050 + 150 = 1200
Step 9: 1200 + 150 = 1350
Step 10: 1350 + 150 = 1500
Step 11: 1500 + 150 = 1650
Step 12: 1650 + 150 = 1800
Step 13: 1800 + 150 = 1950
Step 14: 1950 + 150 = 2100
Step 15: 2100 + 150 = 2250
Step 16: 2250 + 150 = 2400
Step 17: 2400 + 150 = 2550
Step 18: 2550 + 150 = 2700
Step 19: 2700 + 150 = 2850
Step 20: 2850 + 150 = 3000
Step 21: 3000 + 150 = 3150
Step 22: 3150 + 150 = 3300
Step 23: 3300 + 150 = 3450
Step 24: 3450 + 150 = 3600
Step 25: 3600 + 150 = 3750
Step 26: 3750 + 150 = 3900
Step 27: 3900 + 150 = 4050
Step 28: 4050 + 150 = 4200
Step 29: 4200 + 150 = 4350
Step 30: 4350 + 150 = 4500
Step 31: 4500 + 150 = 4650
Step 32: 4650 + 150 = 4800
Step 33: 4800 + 150 = 4950
Step 34: 4950 + 150 = 5100
Step 35: 5100 + 150 = 5250
Step 36: 5250 + 150 = 5400
Step 37: 5400 + 150 = 5550
Step 38: 5550 + 150 = 5700
Step 39: 5700 + 150 = 5850
Step 40: 5850 + 150 = 6000
Step 41: 6000 + 150 = 6150
Step 42: 6150 + 150 = 6300
Step 43: 6300 + 150 = 6450
Step 44: 6450 + 150 = 6600
Step 45: 6600 + 150 = 6750
Step 46: 6750 + 150 = 6900
Step 47: 6900 + 150 = 7050
Step 48: 7050 + 150 = 7200
Step 49: 7200 + 150 = 7350
Step 50: 7350 + 150 = 7500
Step 51: 7500 + 150 = 7650
Step 52: 7650 + 150 = 7800
Step 53: 7800 + 150 = 7950
Step 54: 7950 + 150 = 8100
Step 55: 8100 + 150 = 8250
Step 56: 8250 + 150 = 8400
Step 57: 8400 + 150 = 8550
Step 58: 8550 + 150 = 8700
Step 59: 8700 + 150 = 8850
Step 60: 8850 + 150 = 9000
Step 61: 9000 + 150 = 9150
Step 62: 9150 + 150 = 9300
Step 63: 9300 + 150 = 9450
Step 64: 9450 + 150 = 9600
Step 65: 9600 + 150 = 9750
Step 66: 9750 + 150 = 9900
Step 67: 9900 + 150 = 10050
Step 68: 10050 + 150 = 10200
Step 69: 10200 + 150 = 10350
Step 70: 10350 + 150 = 10500
Step 71: 10500 + 150 = 10650
Step 72: 10650 + 150 = 10800
Step 73: 10800 + 150 = 10950
Step 74: 10950 + 150 = 11100
Step 75: 11100 + 150 = 11250
Step 76: 11250 + 150 = 11400
Step 77: 11400 + 150 = 11550
Step 78: 11550 + 150 = 11700
Step 79: 11700 + 150 = 11850
Step 80: 11850 + 150 = 12000
Step 81: 12000 + 150 = 12150
Step 82: 12150 + 150 = 12300
Step 83: 12300 + 150 = 12450
Step 84: 12450 + 150 = 12600
Step 85: 12600 + 150 = 12750
Step 86: 12750 + 150 = 12900
Step 87: 12900 + 150 = 13050
Step 88: 13050 + 150 = 13200
Step 89: 13200 + 150 = 13350
Step 90: 13350 + 150 = 13500
Step 91: 13500 + 150 = 13650
Step 92: 13650 + 150 = 13800
Step 93: 13800 + 150 = 13950
Step 94: 13950 + 150 = 14100
Step 95: 14100 + 150 = 14250
Step 96: 14250 + 150 = 14400
Step 97: 14400 + 150 = 14550
Step 98: 14550 + 150 = 14700
Step 99: 14700 + 150 = 14850
Step 100: 14850 + 150 = 15000
Step 101: 15000 + 150 = 15150
Step 102: 15150 + 150 = 15300
Step 103: 15300 + 150 = 15450
Step 104: 15450 + 150 = 15600
Step 105: 15600 + 150 = 15750
Step 106: 15750 + 150 = 15900
Step 107: 15900 + 150 = 16050
Step 108: 16050 + 150 = 16200
Step 109: 16200 + 150 = 16350
Step 110: 16350 + 150 = 16500
Step 111: 16500 + 150 = 16650
Step 112: 16650 + 150 = 16800
Step 113: 16800 + 150 = 16950
Step 114: 16950 + 150 = 17100
Step 115: 17100 + 150 = 17250
Step 116: 17250 + 150 = 17400
Step 117: 17400 + 150 = 17550
Step 118: 17550 + 150 = 17700
Step 119: 17700 + 150 = 17850
Step 120: 17850 + 150 = 18000
Step 121: 18000 + 150 = 18150
Step 122: 18150 + 150 = 18300
Step 123: 18300 + 150 = 18450
Step 124: 18450 + 150 = 18600
Step 125: 18600 + 150 = 18750
Step 126: 18750 + 150 = 18900
Step 127: 18900 + 150 = 19050
Step 128: 19050 + 150 = 19200
Step 129: 19200 + 150 = 19350
Step 130: 19350 + 150 = 19500
Step 131: 19500 + 150 = 19650

So, 150*131 = 19650