Let's roll up our sleeves and solve this. We have 160 and we're going to multiply it by 7, essentially adding 160 to itself 7 times.
Step 1: 0 + 160 = 160
Step 2: 160 + 160 = 320
Step 3: 320 + 160 = 480
Step 4: 480 + 160 = 640
Step 5: 640 + 160 = 800
Step 6: 800 + 160 = 960
Step 7: 960 + 160 = 1120

So, 160*7 = 1120