To round a number to the nearest hundreds, you have to look at the tens place. If the tens place is less than 5, then you have to keep the number at the hundreds place; and If the tens place is greater than or equal to 5, then you have to add 1 to the number at the hundreds place.
In the case of 9,228, the 2 at the tens place is less than 5, then 9,228 is rounded as 9,200.