Understanding common logical fallacies is critical to LSAT success.

Logical reasoning involves the ability to construct and deconstruct an argument. Across the four scored sections of the LSAT, you can assume that approximately half of the questions you encounter will involve logical reasoning. It is directly tested in the LSAT's logical reasoning section, and since there are two logical reasoning sections, one reading comprehension section, and one analytical reasoning section, all of which have 35 questions, 50% of the LSAT questions you see will involved logical reasoning.

But, wait, there's more to it than even that. The ability to use logic when understanding an argument is also tested indirectly in the reading comprehension section and the writing sample. Because logical reasoning is such a commonly tested skill on the LSAT, quickly identifying and understanding flawed arguments is critical to achieving a high LSAT score.

One way to understand weaknesses of an argument is knowledge of common logical fallacies.

Although the makers of the LSAT are clear that you do not need to memorize the specific terminology related to flawed arguments below, such as "Ad Hominem" or " Ad Populum," it is important to have a deep understanding of concepts like: argument, premise, assumption, and conclusion.

If you are studying for the LSAT you may consider our private LSAT tutoring. However, we also offer a weekly online small group tutoring option for where you submit logical reasoning question and have them explained to you before or during a live online LSAT review session each week.

What follows are descriptions and examples of 10 common logical fallacies, most of which are likely to appear in the logical reasoning section of the LSAT at one point or another.

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