Greatest common Factor

This topic has expert replies
User avatar
Senior | Next Rank: 100 Posts
Posts: 54
Joined: Sat Jul 09, 2011 5:34 pm
Thanked: 1 times
Followed by:1 members

Greatest common Factor

by golu23 » Tue Jul 12, 2011 8:35 am
Guys can somebody explain me the concept of GCF i just started using manhattan gmat book it's the first topic in it.I did understood LCM but GCF is going way over my head
Source: — GMAT Strategy |

Master | Next Rank: 500 Posts
Posts: 401
Joined: Tue May 24, 2011 1:14 am
Thanked: 37 times
Followed by:5 members

by MBA.Aspirant » Tue Jul 12, 2011 10:17 am
this video is helpful https://www.youtube.com/watch?v=J7K1BLaSX20

basically GCF is like LCM but you only take the prime factors that repeat

so GCF of 45 and 81

45= 3* 3 * 5
81 = 3 * 3* 3 *3

only 3 and a 3 repeat here, so GCF = 3 *3 = 9

Junior | Next Rank: 30 Posts
Posts: 29
Joined: Tue Jul 12, 2011 1:07 pm
Thanked: 8 times
Followed by:1 members

by beatthegmat.garry » Tue Jul 12, 2011 1:30 pm
Right !

You can take the common factors out. Hence the name Greatest common factor.

GCF is the largest number that can be used to divide all the numbers(given in the questions) which results in an integer as the quotient.

Hope this helps :)!

Thanks.

User avatar
Senior | Next Rank: 100 Posts
Posts: 54
Joined: Sat Jul 09, 2011 5:34 pm
Thanked: 1 times
Followed by:1 members

by golu23 » Sat Jul 16, 2011 1:47 am
Dude what does it have to do with ur electric wire rope hoist.Students r trying to study and help each other out.Plz Don't try to market ur products here.If u cant help na plz don't irritate us OK .