OK, let's work through this together. We're starting with 511 and we're going to multiply it by 4, which means we add 511 to itself 4 times.
Step 1: 0 + 511 = 511
Step 2: 511 + 511 = 1022
Step 3: 1022 + 511 = 1533
Step 4: 1533 + 511 = 2044

So, 511*4 = 2044