# Order of Operations: The Key to GMAT Arithmetic

When a straightforward arithmetic problem appears on the GMAT, many test-takers treat it as a break from the more complicated problems that are on the GMAT. While arithmetic problems are often not as complicated as many of the other problems on the test, you should still be careful not to make careless math errors. The most common cause of such errors is a mistake in the order of operations.

# PEMDAS

Operations in an arithmetic problem need to be completed in a specific order. The best way to remember is via the acronym PEMDAS, which stands for **p**arentheses, **e**xponents, **m**ultiplication, **d**ivision, **a**ddition and **s**ubtraction. Regardless of the actual order of the operations listed in the problem, they should always be completed in this order.

# PEMDAS in Action

To see why order of operations is so important, let’s consider the following two expressions:

(5 – 3) + 4 x 6 ,

and

5 – (3 + 4) x 6.

Simplifying the first yields: (5 – 3) + 4 x 6 = 2 + 4 x 6 = 2 + 24 = 26

Simplifying the second yields: 5 – (3 + 4) x 6 = 5 – 7 x 6 = 5 – 42 = -37

Notice that all that changes between these two problems is the placement of the parentheses, but the results are completely different. The wrong answer choices on the GMAT will often be based on mistakes in order of operations, so it is essential to always follow the correct order in order to achieve the highest possible score.

## @KaplanGMATPrep

## July 13

Road to #bschool events are around the corner. Check out the Carlson School of Management profile to get ready http://t.co/rvXWxZk5Vz #GMAT

## Kaplan GMAT Prep

## July 10

Anyone thinking about heading to the midwest for bschool? Check out this week's bschool profile, University of Minnesota Carlson School of Management: http://bit.ly/16rXsKY

University of Minnesota: Carlson School of Management

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The University of Minnesota's Carlson School of Management, located in the twin cities of Minneapolis and St. Paul, has a rich history and over 50,000...