As expected, CBS has pulled the plug on their long-running drama, Numb3rs. A mainstay of the Friday night schedule, brothers Charlie and Don Eppes won’t be back next fall with a seventh season.

Numb3rs revolves around an FBI agent (Rob Morrow) and his genius brother (David Krumholtz) who helps solve cases with mathematics. The cast also features Judd Hirsch (as their father), Alimi Ballard, Dylan Bruno, Navi Rawat, Aya Sumika, and Peter MacNicol.

The cancellation doesn’t come as much of a surprise, especially when you look at the figures.

The ratings have dropped quite a bit in recent years. Last season fell to an average of a 2.2 rating in the all-important 18-49 demographic and 10.2 million total viewers. This season, the ratings dropped further still, to a 1.8 rating and 8.26 million viewers. CBS cut the show’s episode order from 22 to 16 installments last fall. While the official word was that CBS had an overflow of original programming, networks don’t usually cut the orders of successful shows.

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The cast and crew filmed what could serve as a series finale and Morrow and Krumholtz signed on for new TV show pilots. While the actors would be contractually obligated to return to Numb3rs if CBS decided to renew it, ABC and FOX were confident that they wouldn’t.

Last week, it was confirmed that the show’s sets were being dismantled, another sign that Numb3rs was finished. CBS has now made the cancellation official.

On the positive side, Morrow will return next fall in a new series for ABC called The Whole Truth. He’ll play an attorney opposite Joely Richardson. Unfortunately, Krumholtz’s comedy pilot, Tax Man, was not picked up by FOX for the 2010-11 season.

What do you think? Are you satisfied with the way that Numb3rs ended? What will you miss about the show? Will you give The Whole Truth a try?

Image courtesy CBS.