When a number is rounded (or rounded off),
it is approximated by eliminating the least significant digits.
Whole numbers can be rounded to the tens
place, hundreds place, thousands place, and so on.
Decimals can also be rounded, estimating
the number to the nearest tenth, hundredth, thousandth, and
Rounding is used to make a number easier
to work with.
If you know that there are 496 students in
your school, you can say that there are approximately 500
students in your school or 5.68, after rounding will be 6.