Without delay, let's solve this. We've got 331 and we will be multiplying it by 5, that is, adding 331 to itself 5 times.
Step 1: 0 + 331 = 331
Step 2: 331 + 331 = 662
Step 3: 662 + 331 = 993
Step 4: 993 + 331 = 1324
Step 5: 1324 + 331 = 1655

So, 331*5 = 1655