Alright, let's solve this math problem step by step. First, we have the number 100. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 157. So, we're going to take the number 100 and add it to itself 157 times.
Step 1: 0 + 100 = 100
Step 2: 100 + 100 = 200
Step 3: 200 + 100 = 300
Step 4: 300 + 100 = 400
Step 5: 400 + 100 = 500
Step 6: 500 + 100 = 600
Step 7: 600 + 100 = 700
Step 8: 700 + 100 = 800
Step 9: 800 + 100 = 900
Step 10: 900 + 100 = 1000
Step 11: 1000 + 100 = 1100
Step 12: 1100 + 100 = 1200
Step 13: 1200 + 100 = 1300
Step 14: 1300 + 100 = 1400
Step 15: 1400 + 100 = 1500
Step 16: 1500 + 100 = 1600
Step 17: 1600 + 100 = 1700
Step 18: 1700 + 100 = 1800
Step 19: 1800 + 100 = 1900
Step 20: 1900 + 100 = 2000
Step 21: 2000 + 100 = 2100
Step 22: 2100 + 100 = 2200
Step 23: 2200 + 100 = 2300
Step 24: 2300 + 100 = 2400
Step 25: 2400 + 100 = 2500
Step 26: 2500 + 100 = 2600
Step 27: 2600 + 100 = 2700
Step 28: 2700 + 100 = 2800
Step 29: 2800 + 100 = 2900
Step 30: 2900 + 100 = 3000
Step 31: 3000 + 100 = 3100
Step 32: 3100 + 100 = 3200
Step 33: 3200 + 100 = 3300
Step 34: 3300 + 100 = 3400
Step 35: 3400 + 100 = 3500
Step 36: 3500 + 100 = 3600
Step 37: 3600 + 100 = 3700
Step 38: 3700 + 100 = 3800
Step 39: 3800 + 100 = 3900
Step 40: 3900 + 100 = 4000
Step 41: 4000 + 100 = 4100
Step 42: 4100 + 100 = 4200
Step 43: 4200 + 100 = 4300
Step 44: 4300 + 100 = 4400
Step 45: 4400 + 100 = 4500
Step 46: 4500 + 100 = 4600
Step 47: 4600 + 100 = 4700
Step 48: 4700 + 100 = 4800
Step 49: 4800 + 100 = 4900
Step 50: 4900 + 100 = 5000
Step 51: 5000 + 100 = 5100
Step 52: 5100 + 100 = 5200
Step 53: 5200 + 100 = 5300
Step 54: 5300 + 100 = 5400
Step 55: 5400 + 100 = 5500
Step 56: 5500 + 100 = 5600
Step 57: 5600 + 100 = 5700
Step 58: 5700 + 100 = 5800
Step 59: 5800 + 100 = 5900
Step 60: 5900 + 100 = 6000
Step 61: 6000 + 100 = 6100
Step 62: 6100 + 100 = 6200
Step 63: 6200 + 100 = 6300
Step 64: 6300 + 100 = 6400
Step 65: 6400 + 100 = 6500
Step 66: 6500 + 100 = 6600
Step 67: 6600 + 100 = 6700
Step 68: 6700 + 100 = 6800
Step 69: 6800 + 100 = 6900
Step 70: 6900 + 100 = 7000
Step 71: 7000 + 100 = 7100
Step 72: 7100 + 100 = 7200
Step 73: 7200 + 100 = 7300
Step 74: 7300 + 100 = 7400
Step 75: 7400 + 100 = 7500
Step 76: 7500 + 100 = 7600
Step 77: 7600 + 100 = 7700
Step 78: 7700 + 100 = 7800
Step 79: 7800 + 100 = 7900
Step 80: 7900 + 100 = 8000
Step 81: 8000 + 100 = 8100
Step 82: 8100 + 100 = 8200
Step 83: 8200 + 100 = 8300
Step 84: 8300 + 100 = 8400
Step 85: 8400 + 100 = 8500
Step 86: 8500 + 100 = 8600
Step 87: 8600 + 100 = 8700
Step 88: 8700 + 100 = 8800
Step 89: 8800 + 100 = 8900
Step 90: 8900 + 100 = 9000
Step 91: 9000 + 100 = 9100
Step 92: 9100 + 100 = 9200
Step 93: 9200 + 100 = 9300
Step 94: 9300 + 100 = 9400
Step 95: 9400 + 100 = 9500
Step 96: 9500 + 100 = 9600
Step 97: 9600 + 100 = 9700
Step 98: 9700 + 100 = 9800
Step 99: 9800 + 100 = 9900
Step 100: 9900 + 100 = 10000
Step 101: 10000 + 100 = 10100
Step 102: 10100 + 100 = 10200
Step 103: 10200 + 100 = 10300
Step 104: 10300 + 100 = 10400
Step 105: 10400 + 100 = 10500
Step 106: 10500 + 100 = 10600
Step 107: 10600 + 100 = 10700
Step 108: 10700 + 100 = 10800
Step 109: 10800 + 100 = 10900
Step 110: 10900 + 100 = 11000
Step 111: 11000 + 100 = 11100
Step 112: 11100 + 100 = 11200
Step 113: 11200 + 100 = 11300
Step 114: 11300 + 100 = 11400
Step 115: 11400 + 100 = 11500
Step 116: 11500 + 100 = 11600
Step 117: 11600 + 100 = 11700
Step 118: 11700 + 100 = 11800
Step 119: 11800 + 100 = 11900
Step 120: 11900 + 100 = 12000
Step 121: 12000 + 100 = 12100
Step 122: 12100 + 100 = 12200
Step 123: 12200 + 100 = 12300
Step 124: 12300 + 100 = 12400
Step 125: 12400 + 100 = 12500
Step 126: 12500 + 100 = 12600
Step 127: 12600 + 100 = 12700
Step 128: 12700 + 100 = 12800
Step 129: 12800 + 100 = 12900
Step 130: 12900 + 100 = 13000
Step 131: 13000 + 100 = 13100
Step 132: 13100 + 100 = 13200
Step 133: 13200 + 100 = 13300
Step 134: 13300 + 100 = 13400
Step 135: 13400 + 100 = 13500
Step 136: 13500 + 100 = 13600
Step 137: 13600 + 100 = 13700
Step 138: 13700 + 100 = 13800
Step 139: 13800 + 100 = 13900
Step 140: 13900 + 100 = 14000
Step 141: 14000 + 100 = 14100
Step 142: 14100 + 100 = 14200
Step 143: 14200 + 100 = 14300
Step 144: 14300 + 100 = 14400
Step 145: 14400 + 100 = 14500
Step 146: 14500 + 100 = 14600
Step 147: 14600 + 100 = 14700
Step 148: 14700 + 100 = 14800
Step 149: 14800 + 100 = 14900
Step 150: 14900 + 100 = 15000
Step 151: 15000 + 100 = 15100
Step 152: 15100 + 100 = 15200
Step 153: 15200 + 100 = 15300
Step 154: 15300 + 100 = 15400
Step 155: 15400 + 100 = 15500
Step 156: 15500 + 100 = 15600
Step 157: 15600 + 100 = 15700

So, 100*157 = 15700