OK, let's work through this together. We're starting with 54 and we're going to multiply it by 5, which means we add 54 to itself 5 times.
Step 1: 0 + 54 = 54
Step 2: 54 + 54 = 108
Step 3: 108 + 54 = 162
Step 4: 162 + 54 = 216
Step 5: 216 + 54 = 270

So, 54*5 = 270