Let's roll up our sleeves and solve this. We have 164 and we're going to multiply it by 5, essentially adding 164 to itself 5 times.
Step 1: 0 + 164 = 164
Step 2: 164 + 164 = 328
Step 3: 328 + 164 = 492
Step 4: 492 + 164 = 656
Step 5: 656 + 164 = 820

So, 164*5 = 820