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Maths LCM
https://www.elevenplusexams.co.uk/forum/11plus/viewtopic.php?f=2&t=61081
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Author:  oxyeleven [ Tue Sep 29, 2020 7:13 pm ]
Post subject:  Maths LCM

This may sound very basic but still thought of posting

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

Author:  bridge [ Tue Sep 29, 2020 7:17 pm ]
Post subject:  Re: Maths LCM

9

3 x 3 = 9
1 x 9 = 9

Author:  oxyeleven [ Tue Sep 29, 2020 7:29 pm ]
Post subject:  Re: Maths LCM

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

Author:  ToadMum [ Tue Sep 29, 2020 8:08 pm ]
Post subject:  Re: Maths LCM

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...?

Author:  oxyeleven [ Tue Sep 29, 2020 8:23 pm ]
Post subject:  Re: Maths LCM

yes answer is 9 to me also.

Author:  Guest55 [ Tue Sep 29, 2020 8:39 pm ]
Post subject:  Re: Maths LCM

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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