Sure thing, let's get straight to it. We start with 503 and we're going to multiply it by 4, which means adding 503 to itself 4 times.
Step 1: 0 + 503 = 503
Step 2: 503 + 503 = 1006
Step 3: 1006 + 503 = 1509
Step 4: 1509 + 503 = 2012

So, 503*4 = 2012