## GMAT Math: Number Theory

**Introduction:**

As the name suggests, most questions from number theory are about numbers, usually whole numbers or rational numbers. Number Theory questions are simple but not straightforward. Most **GMAT** problems should one way or the other involve number theory. Therefore some call it the heart of algebra and others the heart of mathematics. Unlike other topics, Number Theory has less rules and formulas. It is a subject with vast possibilities for application, which is why most test makers have a large scope of question models. Let's have a look at some problems so that we can understand the importance of basic Number Theory.

## Overview of a GMAT Quantitative session

If I say **GMAT QUANTITATIVE SECTION**, a new **GMAT** test taker might be scared!!! So let me say it simply as **GMAT** MATH SECTION.

## GMAT Statistics: Weighted Average and Evenly Spaced Sets

Arithmetic mean is a mathematical name for the average, a concept we should all be familiar with from early school maths lessons. The **GMAT** takes our basic understanding of the mean and tests it in multiple ways. Once we understand the basics of the arithmetic mean, we will be in a good position to answer any related questions the **GMAT** sets us. In this post we will discuss the concepts of weighted mean and mean of evenly spaced sets.

## GMAT Statistics: Standard Deviation

Many people find statistics to be a complicated subject and shy away from all the numbers and data related questions. One of the biggest causes of concern is the complicated language that is associated with statistics. Words such as 'variance' and 'standard deviation' immediately strike fear because they sound far too complex to comprehend.

## GMAT Statistics: Mode, Median, Range

There is a good chance that you will not even have to deal with a statistics-based question during your **GMAT exam** as such questions rarely appear on the test. But if you have a general understanding of what statistical terms mean, these questions are usually straightforward and quick to answer. In this article, we will look at three simple concepts within statistics, namely, mode, range and median.