Not an exact figure but a good approximation of how they would have scored under the current system.

It was a pretty good approximation of how the golden ball had sat in the small machine.

Or he has a very good approximation of the time it will take.

It is indeed an extremely good approximation to call such an object 'black'.

These laws are a good approximation to the behavior of many gases.

This function is a very good approximation to the number of prime numbers less than x.

"It's a pretty good approximation of the view," he said.

Not a perfect control of either, but a good approximation.

The latter is a pretty good approximation, but there are important exceptions.

Thus the assumption of steady state is a very good approximation.