11 Plus Exams Forumhttps://www.elevenplusexams.co.uk/forum/11plus/ Maths LCMhttps://www.elevenplusexams.co.uk/forum/11plus/viewtopic.php?f=2&t=61081 Page 1 of 1

 Author: oxyeleven [ Tue Sep 29, 2020 8:13 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 8:17 pm ] Post subject: Re: Maths LCM 93 x 3 = 91 x 9 = 9

 Author: oxyeleven [ Tue Sep 29, 2020 8:29 pm ] Post subject: Re: Maths LCM my answer is also 9but it seems 18 is LCM of 3 and 9, this was told to my kid 3 6 9 12 15 189 18 27 36 hence 18

 Author: ToadMum [ Tue Sep 29, 2020 9:08 pm ] Post subject: Re: Maths LCM oxyeleven wrote:my answer is also 9but it seems 18 is LCM of 3 and 9, this was told to my kid 3 6 9 12 15 189 18 27 36 hence 18But in that example, the series still intersect at 9...?

 Author: oxyeleven [ Tue Sep 29, 2020 9:23 pm ] Post subject: Re: Maths LCM yes answer is 9 to me also.

 Author: Guest55 [ Tue Sep 29, 2020 9:39 pm ] Post subject: Re: Maths LCM oxyeleven wrote:my answer is also 9but it seems 18 is LCM of 3 and 9, this was told to my kid 3 6 9 12 15 189 18 27 36 hence 18Wrong - it is 9 [Graduate mathematician and qualified teacher] - LOWEST common multiple

 Author: Mathsatish [ Mon Dec 14, 2020 6:13 pm ] Post subject: Re: Maths LCM LCM means lowest common multipleIF they asked what is the LCM of 3,9Multiples of 3 are 3,6,9,12,15,18,21,24,27,30Multiples of 9 are 9,18,27,36,45,54,63,72,81,90Common multiples of 3,9 are 9,18,27,36,45,54,63,72,81,90Among the common multiples what is the lowest common multiple of 3,9?..Answer is 9..18 is a common multiple of 3,9 but not the lowest common multiple..If there are two numbers A,B, A is a smaller number and B is a bigger number.If A goes into B then the LCM of A,B is BExamples : LCM of 3,15 answer is 15Lcm of 4,16 Answer is 16...

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