OK, let's work through this together. We're starting with 450 and we're going to multiply it by 66, which means we add 450 to itself 66 times.
Step 1: 0 + 450 = 450
Step 2: 450 + 450 = 900
Step 3: 900 + 450 = 1350
Step 4: 1350 + 450 = 1800
Step 5: 1800 + 450 = 2250
Step 6: 2250 + 450 = 2700
Step 7: 2700 + 450 = 3150
Step 8: 3150 + 450 = 3600
Step 9: 3600 + 450 = 4050
Step 10: 4050 + 450 = 4500
Step 11: 4500 + 450 = 4950
Step 12: 4950 + 450 = 5400
Step 13: 5400 + 450 = 5850
Step 14: 5850 + 450 = 6300
Step 15: 6300 + 450 = 6750
Step 16: 6750 + 450 = 7200
Step 17: 7200 + 450 = 7650
Step 18: 7650 + 450 = 8100
Step 19: 8100 + 450 = 8550
Step 20: 8550 + 450 = 9000
Step 21: 9000 + 450 = 9450
Step 22: 9450 + 450 = 9900
Step 23: 9900 + 450 = 10350
Step 24: 10350 + 450 = 10800
Step 25: 10800 + 450 = 11250
Step 26: 11250 + 450 = 11700
Step 27: 11700 + 450 = 12150
Step 28: 12150 + 450 = 12600
Step 29: 12600 + 450 = 13050
Step 30: 13050 + 450 = 13500
Step 31: 13500 + 450 = 13950
Step 32: 13950 + 450 = 14400
Step 33: 14400 + 450 = 14850
Step 34: 14850 + 450 = 15300
Step 35: 15300 + 450 = 15750
Step 36: 15750 + 450 = 16200
Step 37: 16200 + 450 = 16650
Step 38: 16650 + 450 = 17100
Step 39: 17100 + 450 = 17550
Step 40: 17550 + 450 = 18000
Step 41: 18000 + 450 = 18450
Step 42: 18450 + 450 = 18900
Step 43: 18900 + 450 = 19350
Step 44: 19350 + 450 = 19800
Step 45: 19800 + 450 = 20250
Step 46: 20250 + 450 = 20700
Step 47: 20700 + 450 = 21150
Step 48: 21150 + 450 = 21600
Step 49: 21600 + 450 = 22050
Step 50: 22050 + 450 = 22500
Step 51: 22500 + 450 = 22950
Step 52: 22950 + 450 = 23400
Step 53: 23400 + 450 = 23850
Step 54: 23850 + 450 = 24300
Step 55: 24300 + 450 = 24750
Step 56: 24750 + 450 = 25200
Step 57: 25200 + 450 = 25650
Step 58: 25650 + 450 = 26100
Step 59: 26100 + 450 = 26550
Step 60: 26550 + 450 = 27000
Step 61: 27000 + 450 = 27450
Step 62: 27450 + 450 = 27900
Step 63: 27900 + 450 = 28350
Step 64: 28350 + 450 = 28800
Step 65: 28800 + 450 = 29250
Step 66: 29250 + 450 = 29700

So, 450*66 = 29700