Let's get this math done. We have 54 and we're going to multiply it by 10. This is the same as taking 54 and adding it to itself 10 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
Step 6: 270 + 54 = 324
Step 7: 324 + 54 = 378
Step 8: 378 + 54 = 432
Step 9: 432 + 54 = 486
Step 10: 486 + 54 = 540

So, 54*10 = 540