Well, honey, 545 rounded to the nearest 100 is 500. It's not rocket science, just chop off the extra digits and call it a day. Now go out there and conquer the world with your newfound knowledge.
When rounding 545 to the nearest hundred, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down to 500. Therefore, 545 rounded to the nearest hundred is 500.