OK, let's work through this together. We're starting with 558 and we're going to multiply it by 3, which means we add 558 to itself 3 times.
Step 1: 0 + 558 = 558
Step 2: 558 + 558 = 1116
Step 3: 1116 + 558 = 1674

So, 558*3 = 1674