OK, let's work through this together. We're starting with 481 and we're going to multiply it by 4, which means we add 481 to itself 4 times.
Step 1: 0 + 481 = 481
Step 2: 481 + 481 = 962
Step 3: 962 + 481 = 1443
Step 4: 1443 + 481 = 1924

So, 481*4 = 1924