Let's roll up our sleeves and solve this. We have 628 and we're going to multiply it by 18, essentially adding 628 to itself 18 times.
Step 1: 0 + 628 = 628
Step 2: 628 + 628 = 1256
Step 3: 1256 + 628 = 1884
Step 4: 1884 + 628 = 2512
Step 5: 2512 + 628 = 3140
Step 6: 3140 + 628 = 3768
Step 7: 3768 + 628 = 4396
Step 8: 4396 + 628 = 5024
Step 9: 5024 + 628 = 5652
Step 10: 5652 + 628 = 6280
Step 11: 6280 + 628 = 6908
Step 12: 6908 + 628 = 7536
Step 13: 7536 + 628 = 8164
Step 14: 8164 + 628 = 8792
Step 15: 8792 + 628 = 9420
Step 16: 9420 + 628 = 10048
Step 17: 10048 + 628 = 10676
Step 18: 10676 + 628 = 11304

So, 628*18 = 11304