Usually we use a finite number of digits and accept an approximate answer with roundoff error.

Most nomograms are used in applications where an approximate answer is appropriate and useful.

I could have given you an approximate answer hours ago.

Integer arithmetic should be used, to avoid the problems of approximate answers.

An approximate answer will not earn a Snickers bar from him.

Bran shut up, listened to the problem as given, and came in with the second-closest approximate answer.

However, even only one cycle of corrections often provides an excellent approximate answer to what the real solution should be.

Individuals also give approximate answers to simple questions such as, "How many legs on a cat?"

Individuals also give approximate answers to simple questions.

This will be an approximate answer, but a very good one.