Let's roll up our sleeves and solve this. We have 450 and we're going to multiply it by 23, essentially adding 450 to itself 23 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

So, 450*23 = 10350