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 Post subject: Maths LCM
PostPosted: Tue Sep 29, 2020 7:13 pm 
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Joined: Fri Sep 26, 2014 8:34 pm
Posts: 4
This may sound very basic but still thought of posting

what is LCM of 3 & 9, is it 9 or 18


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 Post subject: Re: Maths LCM
PostPosted: Tue Sep 29, 2020 7:17 pm 
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Joined: Tue Feb 12, 2013 12:38 am
Posts: 123
9

3 x 3 = 9
1 x 9 = 9


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 Post subject: Re: Maths LCM
PostPosted: Tue Sep 29, 2020 7:29 pm 
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Joined: Fri Sep 26, 2014 8:34 pm
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my answer is also 9
but it seems 18 is LCM of 3 and 9, this was told to my kid

3 6 9 12 15 18

9 18 27 36

hence 18


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 Post subject: Re: Maths LCM
PostPosted: Tue Sep 29, 2020 8:08 pm 
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Joined: Wed Jan 18, 2012 11:41 am
Posts: 10303
Location: Essex
oxyeleven wrote:
my answer is also 9
but it seems 18 is LCM of 3 and 9, this was told to my kid

3 6 9 12 15 18

9 18 27 36

hence 18


But in that example, the series still intersect at 9...?

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 Post subject: Re: Maths LCM
PostPosted: Tue Sep 29, 2020 8:23 pm 
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Joined: Fri Sep 26, 2014 8:34 pm
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yes answer is 9 to me also.


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 Post subject: Re: Maths LCM
PostPosted: Tue Sep 29, 2020 8:39 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 16237
oxyeleven wrote:
my answer is also 9
but it seems 18 is LCM of 3 and 9, this was told to my kid

3 6 9 12 15 18

9 18 27 36

hence 18


Wrong - it is 9 [Graduate mathematician and qualified teacher] - LOWEST common multiple


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