Let's roll up our sleeves and solve this. We have 804 and we're going to multiply it by 3, essentially adding 804 to itself 3 times.
Step 1: 0 + 804 = 804
Step 2: 804 + 804 = 1608
Step 3: 1608 + 804 = 2412

So, 804*3 = 2412