OK, let's crack this. We're given 585 and our task is to multiply it by 3. Essentially, we'll be adding 585 to itself 3 times.
Step 1: 0 + 585 = 585
Step 2: 585 + 585 = 1170
Step 3: 1170 + 585 = 1755

So, 585*3 = 1755