Let's get this math done. We have 305 and we're going to multiply it by 4. This is the same as taking 305 and adding it to itself 4 times.
Step 1: 0 + 305 = 305
Step 2: 305 + 305 = 610
Step 3: 610 + 305 = 915
Step 4: 915 + 305 = 1220

So, 305*4 = 1220