Rounded numbers are easier to work with in your head. They are only approximate.
An exact answer can not be obtained with these numbers. Sometimes an exact answer
is not required.
To round numbers to the nearest thousand, make the numbers that end in 1 through 499
into the next lower number that ends in 000. For example, 6424 rounded to the nearest
thousand would be 6000. Numbers that have the last three digits of 500 or more should
be rounded up to the next even thousand. The number 8988 rounded to the nearest
hundred would be 9000.