Let's get this math done. We have 200 and we're going to multiply it by 4. This is the same as taking 200 and adding it to itself 4 times.
Step 1: 0 + 200 = 200
Step 2: 200 + 200 = 400
Step 3: 400 + 200 = 600
Step 4: 600 + 200 = 800

So, 200*4 = 800