The most used rule to rounding a number to the nearest hundred is the following:
• If the last two digits in the number are ,50 or above,, we round ,up,;
,
• if the last two digits are ,49 or below,, we round ,down,.
Then, all the numbers from 450 to 549 can be rounded to 500.
Therefore, the greatest is 549 and the least is 450.