OK, let's crack this. We're given 818 and our task is to multiply it by 5. Essentially, we'll be adding 818 to itself 5 times.
Step 1: 0 + 818 = 818
Step 2: 818 + 818 = 1636
Step 3: 1636 + 818 = 2454
Step 4: 2454 + 818 = 3272
Step 5: 3272 + 818 = 4090

So, 818*5 = 4090