OK, let's work through this together. We're starting with 545 and we're going to multiply it by 5, which means we add 545 to itself 5 times.
Step 1: 0 + 545 = 545
Step 2: 545 + 545 = 1090
Step 3: 1090 + 545 = 1635
Step 4: 1635 + 545 = 2180
Step 5: 2180 + 545 = 2725

So, 545*5 = 2725