OK, let's work through this together. We're starting with 165 and we're going to multiply it by 4, which means we add 165 to itself 4 times.
Step 1: 0 + 165 = 165
Step 2: 165 + 165 = 330
Step 3: 330 + 165 = 495
Step 4: 495 + 165 = 660

So, 165*4 = 660