Let's get this math done. We have 300 and we're going to multiply it by 51. This is the same as taking 300 and adding it to itself 51 times.
Step 1: 0 + 300 = 300
Step 2: 300 + 300 = 600
Step 3: 600 + 300 = 900
Step 4: 900 + 300 = 1200
Step 5: 1200 + 300 = 1500
Step 6: 1500 + 300 = 1800
Step 7: 1800 + 300 = 2100
Step 8: 2100 + 300 = 2400
Step 9: 2400 + 300 = 2700
Step 10: 2700 + 300 = 3000
Step 11: 3000 + 300 = 3300
Step 12: 3300 + 300 = 3600
Step 13: 3600 + 300 = 3900
Step 14: 3900 + 300 = 4200
Step 15: 4200 + 300 = 4500
Step 16: 4500 + 300 = 4800
Step 17: 4800 + 300 = 5100
Step 18: 5100 + 300 = 5400
Step 19: 5400 + 300 = 5700
Step 20: 5700 + 300 = 6000
Step 21: 6000 + 300 = 6300
Step 22: 6300 + 300 = 6600
Step 23: 6600 + 300 = 6900
Step 24: 6900 + 300 = 7200
Step 25: 7200 + 300 = 7500
Step 26: 7500 + 300 = 7800
Step 27: 7800 + 300 = 8100
Step 28: 8100 + 300 = 8400
Step 29: 8400 + 300 = 8700
Step 30: 8700 + 300 = 9000
Step 31: 9000 + 300 = 9300
Step 32: 9300 + 300 = 9600
Step 33: 9600 + 300 = 9900
Step 34: 9900 + 300 = 10200
Step 35: 10200 + 300 = 10500
Step 36: 10500 + 300 = 10800
Step 37: 10800 + 300 = 11100
Step 38: 11100 + 300 = 11400
Step 39: 11400 + 300 = 11700
Step 40: 11700 + 300 = 12000
Step 41: 12000 + 300 = 12300
Step 42: 12300 + 300 = 12600
Step 43: 12600 + 300 = 12900
Step 44: 12900 + 300 = 13200
Step 45: 13200 + 300 = 13500
Step 46: 13500 + 300 = 13800
Step 47: 13800 + 300 = 14100
Step 48: 14100 + 300 = 14400
Step 49: 14400 + 300 = 14700
Step 50: 14700 + 300 = 15000
Step 51: 15000 + 300 = 15300

So, 300*51 = 15300