How does rounding work in the decimal system?

In the decimal system, when rounding numbers you look at the digit to the right of the desired decimal place. If that digit is 5 or greater, you round up; if it's less than 5, you round down. For example, if rounding to the nearest whole number and you have 4.6, it would round up to 5, but if you have 4.4, it would round down to 4.