Without delay, let's solve this. We've got 16 and we will be multiplying it by 5, that is, adding 16 to itself 5 times.
Step 1: 0 + 16 = 16
Step 2: 16 + 16 = 32
Step 3: 32 + 16 = 48
Step 4: 48 + 16 = 64
Step 5: 64 + 16 = 80

So, 16*5 = 80