OK, let's work through this together. We're starting with 80 and we're going to multiply it by 7, which means we add 80 to itself 7 times.
Step 1: 0 + 80 = 80
Step 2: 80 + 80 = 160
Step 3: 160 + 80 = 240
Step 4: 240 + 80 = 320
Step 5: 320 + 80 = 400
Step 6: 400 + 80 = 480
Step 7: 480 + 80 = 560

So, 80*7 = 560