Lesson: Eliminating Fractions

Reinforcement Activities

Comment on Eliminating Fractions

Byefox - December 30, 2017
How do we find the least common multiple of all 5 denominators? (which = (5^5)(7^5)) for this question:

https://gmatclub.com/forum/which-of-the-following-has-the-greatest-value-248206.html
gmat-admin's picture

gmat-admin - December 30, 2017

Question link: https://gmatclub.com/forum/which-of-the-following-has-the-greatest-value...

I knew that the least common multiple of the five denominators will consist of powers of 5 and 7.

First, since the biggest power of 5 is 5^5, the least common multiple must have 5^5

Likewise, since the biggest power of 7 is 7^5, the least common multiple must have 7^5.

Does that help?

Cheers,
Brent

vedavarunn - February 2, 2019
It was nice to see this different question! :)

sjiang24 - September 26, 2021
for the first one you can just multiply 5 to both side, though it can be larger number to solve.
gmat-admin's picture

gmat-admin - September 26, 2021

That also works.

Office Hours

Have questions about your preparation or an upcoming test? Need help modifying the Study Plan to meet your unique needs? No problem. Just book a Skype meeting with Brent to discuss these and any other questions you may have. 

Book a Skype meeting

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Have a question about this video?

Post your question in the Comment section below, and a GMAT expert will answer it as fast as humanly possible.

© 2011 - 2023 Isla Verde Education Inc.

GMAT™ and GMATPrep™ are registered trademarks of the Graduate Management Admission Council™
The Graduate Management Admission Council™ does not endorse, nor is it affiliated in any way with the owner of this web site.

Free “Question of the Day” emails!