Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
09 May 2015, 10:07
Kudos
Bookmarks
Hi there,
I have a question regarding the use of parenthesis and dividing/multiplication.
As an example:
\((1,5 * 10^3) / (0,5 * 10^6) = (1,5 / 0,5) * (10^3 / 10^6)\)
Why can you just switch \(10^3\) with \(0,5\) and then switch the dividing and multiplication signs. I have no idea when to
use methods or apply rules like this so if anyone has an explanation
I have a question regarding the use of parenthesis and dividing/multiplication.
As an example:
\((1,5 * 10^3) / (0,5 * 10^6) = (1,5 / 0,5) * (10^3 / 10^6)\)
Why can you just switch \(10^3\) with \(0,5\) and then switch the dividing and multiplication signs. I have no idea when to
use methods or apply rules like this so if anyone has an explanation
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
09 May 2015, 10:53
Kudos
Bookmarks
Hi MarcvR,
It sounds like you're interested in broader PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction) rules. These rules dictate the order in which you have to do calculations.
In the prompt you've provided, no calculations have actually been done - the prompt has just been re-written (and it's worth noting that the 10^3 and 0.5 were NOT "switched").
Notice how the numbers in both the numerator and denominator are MULTIPLIED. This means that we can re-write the fraction in a variety of different ways. The example that you listed is complex-looking, so I'm going to show you some simpler examples:
(1/2)(3/5) can be rewritten in any of the following ways (notice that the end calculation is always the SAME):
(1/2)(3/5) = 3/10
(1x3)/(2x5) = 3/10
(3x1)/(5x2) = 3/10
(1/5)(3/2) = 3/10
The same rules apply to the example that you listed. It might be that you just need more practice with hands-on calculations.
How long have you been studying?
What resources have you been using?
What is your goal score?
When are you planning to take the GMAT?
GMAT assassins aren't born, they're made,
Rich
It sounds like you're interested in broader PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction) rules. These rules dictate the order in which you have to do calculations.
In the prompt you've provided, no calculations have actually been done - the prompt has just been re-written (and it's worth noting that the 10^3 and 0.5 were NOT "switched").
Notice how the numbers in both the numerator and denominator are MULTIPLIED. This means that we can re-write the fraction in a variety of different ways. The example that you listed is complex-looking, so I'm going to show you some simpler examples:
(1/2)(3/5) can be rewritten in any of the following ways (notice that the end calculation is always the SAME):
(1/2)(3/5) = 3/10
(1x3)/(2x5) = 3/10
(3x1)/(5x2) = 3/10
(1/5)(3/2) = 3/10
The same rules apply to the example that you listed. It might be that you just need more practice with hands-on calculations.
How long have you been studying?
What resources have you been using?
What is your goal score?
When are you planning to take the GMAT?
GMAT assassins aren't born, they're made,
Rich
09 May 2015, 10:54
Kudos
Bookmarks
Here, you're just using the rule for multiplying fractions, but in reverse. You have probably learned that:
\(\left( \frac{a}{b} \right) \left( \frac{c}{d} \right) = \frac{ac}{bd}\)
This rule works in both directions; if we have something that looks like the left side, we can rewrite it to look like the right side, and vice versa. In your example, you start with something that looks like the right side of the equation above, and have rewritten it to look like the left side.
\(\left( \frac{a}{b} \right) \left( \frac{c}{d} \right) = \frac{ac}{bd}\)
This rule works in both directions; if we have something that looks like the left side, we can rewrite it to look like the right side, and vice versa. In your example, you start with something that looks like the right side of the equation above, and have rewritten it to look like the left side.
