The 45º angle Fact: All lines with slopes of 1 make 45º angles with both the x- and y-axes. Conversely, if a line makes a 45º angles with either the x- of y-axes, you know immediately its slope must be . This first fact is true, not only for y = x and y = [...]
Archive | Math RSS feed for this section
GMAT Trick: “Drawn as Accurately as Possible”
Using the information given in diagrams to your advantage The following sentences appear in the directions to the GMAT Problem Solving questions. A figure accompanying a problem solving questions is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Many GMAT-takers underestimate [...]
GMAT Math: Terminating and Repeating Decimals
The topic of decimals, and patterns of decimals, seems to be of slightly greater interest to GMAC in the GMAT OG13e than in previous editions. What decimals terminate? What decimals repeat? In this post, we’ll take a look at these questions. Rational Numbers Integers are positive and negative whole numbers, including zero. Here are [...]
Integrated Reasoning Question Type: Bar Charts
Fact: One common way data will displayed on GMAT Integrated Reasoning questions is in bar charts. This post is a whirlwind overview of what you need to know about the varieties of bar charts in order to be successful with them on the new IR section. Bars & Columns Some sources call a graph [...]
Variables in GMAT Answer Choices: Algebraic Approach vs. Numerical Approach
Fact: On GMAT Problem Solving, some of the prompts will state quantities in terms of variables, and then expect you to answer in terms of those variables. Such questions are known as “variable in the answer choice” questions (or VICs in some circles). Fact: There are two basic strategies you can use to solve these: [...]
How to Actually Improve Your Score on the GMAT Quant Section
Know the fundamentals To do well on the GMAT quant, you can’t guess your way through, relying on techniques such as process of elimination or approximation. At a certain point you have to know the properties of a right triangle or the difference between dependent and independent events in probability. Of course the range of [...]
GMAT Integrated Reasoning: Bubble Charts
Fact: When GMAT Integrated Reasoning appears, starting in June 2012, one type of chart about which the GMAT IR can ask is a bubble chart. What in Sam Hill is a bubble chart? Scatterplots A bubble chart is a close cousin to a scatterplot. In a scatterplot, each data point has values in two [...]
Integer Properties: The Most Common GMAT Question Topic
Fact: one of the most tested categories of concepts on the GMAT Quantitative section is Integer Properties What are the “properties of integers”? Probably none of these are brand new to you —- in fact, you probably learned about all these in grade school. Here’s a list. a) factors and multiples; GCF and LCM b) [...]
GMAT OG Case Study: Problem Solving Practice Problem #163
Here is the problem that appears in the OG, 12th Edition: Problem Solving Practice Problem #163 This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar he saves this year, he will have 1 + r dollars [...]
Sneak Peek: New GMAT Official Guide 13th Edition Math
Advance copies of the 13th edition of the GMAT Official Guide (turquoise cover) have been released. Changes in Problems Used The vast majority of the math questions in the 12th edition Official Guide appear verbatim but in a different order, than in the 13th edition. Here’s a list of questions in the OG 12 that [...]
