OK, let's work through this together. We're starting with 531 and we're going to multiply it by 4, which means we add 531 to itself 4 times.
Step 1: 0 + 531 = 531
Step 2: 531 + 531 = 1062
Step 3: 1062 + 531 = 1593
Step 4: 1593 + 531 = 2124

So, 531*4 = 2124