Sure thing! We've got 800 and we're gonna multiply it by 4. That's the same as adding 800 to itself 4 times.
Step 1: 0 + 800 = 800
Step 2: 800 + 800 = 1600
Step 3: 1600 + 800 = 2400
Step 4: 2400 + 800 = 3200

So, 800*4 = 3200