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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 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 
9 3 x 3 = 9 1 x 9 = 9 
Author:  oxyeleven [ Tue Sep 29, 2020 8:29 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 9:08 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 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 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 
Author:  Mathsatish [ Mon Dec 14, 2020 6:13 pm ] 
Post subject:  Re: Maths LCM 
LCM means lowest common multiple IF they asked what is the LCM of 3,9 Multiples of 3 are 3,6,9,12,15,18,21,24,27,30 Multiples of 9 are 9,18,27,36,45,54,63,72,81,90 Common multiples of 3,9 are 9,18,27,36,45,54,63,72,81,90 Among 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 B Examples : LCM of 3,15 answer is 15 Lcm of 4,16 Answer is 16... 
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