
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
 LinkBack  Thread Tools  Display Modes 
April 27th, 2018, 08:15 AM  #1 
Newbie Joined: Apr 2018 From: United States Posts: 1 Thanks: 0  Factoring large odd/uneven numbers?
I fell into this problem when trying to figure out a way to subtract fractions with big uneven denominators, and am stuck. How do we use prime factorization for numbers like this? 2/57  9/67 Is it okay if you get fractions in prime factorization? What should I do? Thank you! 
April 27th, 2018, 08:32 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,421 Thanks: 832 
a/u  b/v = (av  bu) / (uv)

April 28th, 2018, 11:47 AM  #3 
Senior Member Joined: May 2016 From: USA Posts: 1,030 Thanks: 420 
As Denis implies, you may have been taught to find the least common denominator when adding or subtracting fractions, but that is not at all necessary. What is necessary is to find a common denominator. And that is most simply done by finding the product of the denominators. EDIT: In the case of your example, where denominators are both prime numbers and cannot be factored, their product is the least common denominator, but such a product will always be a common denominator. Last edited by JeffM1; April 28th, 2018 at 12:07 PM. 

Tags 
factoring, large, numbers, odd or uneven 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
ratios with large numbers  marf  New Users  1  June 10th, 2017 11:56 AM 
large numbers?  jk12  Math  0  May 13th, 2017 04:45 PM 
Are large numbers definable?  jk12  Math  42  May 18th, 2015 02:14 PM 
Law of Large Numbers and Expected Value  Tomi  Advanced Statistics  0  February 12th, 2014 12:00 PM 
Law of Large Numbers and the Expected Value  jimmy  Advanced Statistics  4  July 18th, 2012 12:23 PM 