Sure thing, let's get straight to it. We start with 545 and we're going to multiply it by 4, which means adding 545 to itself 4 times.
Step 1: 0 + 545 = 545
Step 2: 545 + 545 = 1090
Step 3: 1090 + 545 = 1635
Step 4: 1635 + 545 = 2180

So, 545*4 = 2180