GCF and LCM of multiple numbers

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pavand: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Wed Jul 20, 2011 3:10 am; Thanked: 2 times

GCF and LCM of multiple numbers

by pavand » Thu Sep 22, 2011 5:42 am

1. Is it true that GCF(90,5,5,5) = GCF(90,5,5) = GCF(90,5) = 5?

2. Is it true that LCM(80,4,4,4) = LCM(80,4,4) = LCM(80,4) = 80?

3. What is the GCF(400,28,24). Answer = 4

4. What is the LCM(220,12,8). Answer = 1320

Please explain the steps to arrive at the above solutions

Last edited by pavand on Thu Sep 22, 2011 5:54 am, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Thu Sep 22, 2011 5:42 am

gmatclubmember: Master | Next Rank: 500 Posts; Posts: 158; Joined: Sat Sep 03, 2011 10:31 am; Thanked: 29 times; Followed by:2 members

by gmatclubmember » Thu Sep 22, 2011 5:51 am

pavand wrote:1. Is it true that GCF(90,5,5,5) = GCF(90,5,5) = GCF(90,5) = 5?

2. Is it true that LCM(80,4,4,4) = LCM(80,4,4) = LCM(80,4) = 80?

3. What is the GCF(400,28,24). Answer = 4

4. What is the LCM(220,12,8). Answer = 1320

You are right on all the 4 points.
What is your doubt exactly??

Cheers
Ami/-