Let's get this math done. We have 387 and we're going to multiply it by 4. This is the same as taking 387 and adding it to itself 4 times.
Step 1: 0 + 387 = 387
Step 2: 387 + 387 = 774
Step 3: 774 + 387 = 1161
Step 4: 1161 + 387 = 1548

So, 387*4 = 1548