The secret to scoring high in Quantitative Reasoning in GRE-Crack the Quantitative Comparison Questions Every Quantitative Reasoing. This is 40 per cent of the entire section. A few basic principles will help in making the most of these scoring opportunities. There are specific instructions for each question type in the GRE. You won’t find any surprises in the exam. Familiarize yourself with the instructions during the preparation. Don’t waste your time reading these in the exam. Here is example Quantitative Comparison question.
Directions: Compare Quantity A and Quantity B, suing additional information centered above the two quantities if such information is given and select one of the following four answer choices:
- Quantity A is greater
- Quantity B is greater
- two quantities are equal
- Both relationship cannot be determined from the information mentioned
Quantity A Quantity B
In addition to the two quantities given in the two columns did you notice that we are given an additional statement?-4<x<5
This statement forms the basis for the comparison. When a Question like this is given, many students get excited and fall in various traps specifically designed to catch such behavior.
Trap#1: Many test takers see that Quantity A is (+2)2 and Quantity B is (+3)2. And then go on to decide that Quantity B is bigger Don’t jump the gun. See what happens when =-3.
Trap#2: Some test takers try to substitute several values. Let us say someone substitutes the values for= 0, 1 and 2. They notice that quantity B is bigger in these three cases. Caught They didn’t choose the right values.
Trap#3: What happens if we substitute= 2,-1,1 and 2?
You might feel that we are substituting a good mix of positive and negative values. Unfortunately, that will still force you to miss the fact that you can’t find the relationship between them.
Trap#4: How about substituting various values for X like-4, -3.9, – 3.1, -3, -2, -1, 0, 1, 2 , 3, 4, 5? while the method might give an answer, it will consume a lot of time. How do we do it in a way that doesn’t take so much time? we can start by subtracting the two quantities.
we get – =2 +5 =2 (+2.5). Because is between -4 and 5, (+2.5) will between -1.5 and 7.5.
Is (+2.5) positive in this case? we can’t say. It can be positive or negative or even zero. we realize that (-) can be positive or negative depending on x. So, we can’t decide which of the two is bigger. The GRE exam is know for questions like this. Most questions can be answered in fewer than 5 steps. You need to be good at the basics and know how to steer clear of the traps.
GRE Tips and how you can increase your accuracy in solving questions
If the expressions looks similar but have some terms that are different, it might be a good idea to subtract them, proving that A-B is greater than zero is same as proving that A>B. we might end up saving a lot of time by doing this.
Some times, it is easier to divide the two quantities. If A and B are both positive, proving that A/B is grater than 1 is same as proving that A>B. When we divide, we might be able to cancel a few terms and make our job easier. Remember not to cancel an expression that can be zero.
If the question is all about numbers with no variables involved, see if you can approximate the values. Some times, calculations can be difficult even with a calculator in hand.
In most of questions that test whether you can make a simple observation. The two quantities will be similar in most aspects and differ in one aspect.
When a question involves variables, we can substitute values to highlight that the relationship cannot be determined however, we shouldn’t use this method to prove that one of the quantities is bigger than the other.
If you find yourself spending more than 45 seconds on a quantitative comparison question, you should stop. You won’t get any bonus marks for solving tougher questions. Feel to guess an answer and move to next question.