Let's get this math done. We have 171 and we're going to multiply it by 5. This is the same as taking 171 and adding it to itself 5 times.
Step 1: 0 + 171 = 171
Step 2: 171 + 171 = 342
Step 3: 342 + 171 = 513
Step 4: 513 + 171 = 684
Step 5: 684 + 171 = 855

So, 171*5 = 855