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

So, 0*5 = 0