Sure thing! We've got 80 and we're gonna multiply it by 4. That's the same as adding 80 to itself 4 times.
Step 1: 0 + 80 = 80
Step 2: 80 + 80 = 160
Step 3: 160 + 80 = 240
Step 4: 240 + 80 = 320

So, 80*4 = 320