How Did You Count Them so Quickly?

An actuary and a farmer were traveling by train. When they passed a flock of sheep in a meadow, the actuary said, “There are 1,248 sheep out there.”

The farmer replied, “Amazing. By chance, I know the owner, and the figure is absolutely correct. How did you count them so quickly?”

The actuary answered, “Easy, I just counted the number of legs and divided by four.”