Hi,
432 rounded to the nearest hundred is 400. Why? Because when you look at the tens place, if it's 5 or lower, it would round to the same number. If it's 6 and up, you round it +1 number. Example: 576; Look at the tens place. It's 6+ so it's rounded to 600. 212; Look at the tens place. It's 5 and below so it rounds to 200.