Without delay, let's solve this. We've got 804 and we will be multiplying it by 5, that is, adding 804 to itself 5 times.
Step 1: 0 + 804 = 804
Step 2: 804 + 804 = 1608
Step 3: 1608 + 804 = 2412
Step 4: 2412 + 804 = 3216
Step 5: 3216 + 804 = 4020

So, 804*5 = 4020