Question

Find the lowest common multiple please :)

Answer 1

\[\frac{ 2 }{ 3 } \frac{ 2 }{ 27 } \frac{ 5 }{ 6 } \frac{ 7 }{ 9} \frac{ 8 }{ 9 }\]

Answer 2

@hartnn

Answer 3

LCM: 3,9,3,3,2,9,9??

Answer 4

the LCM cant be smaller than the largest number.

Answer 5

27 is dividible by all except 6 so multiply by 2 and try 54
is it common in all denominators?

Answer 6

holly crap that's the LCM:54

Answer 7

How did you find that out?

Answer 8

guess and check
ther is a proper way but it takes a long time

Answer 9

how did you guess?

Answer 10

one method is to prime out the values and drop down the columns.

3
333
2 3
33
33
------
2 333 = LCM

Answer 11

educational guess
not a random guess
i picked 54 because it is divisible by 3 and 9 and 27 and 6

Answer 12

ahh..

Answer 13

Lcm of 3,9,3,9,2,9,9 what ??

Answer 14

idk i wasn't sure, about that @No.name forget what i wrote.

Answer 15

@amistre64 how did you know to put the 2 in front of the 3??

Answer 16

3,27,6,9,9

3=3*1
27=3*3*3*1
6=3*2
9=3*3
9=3*3

Lcm= 3*3*3*2=54


I took 3 three times as highest number of occurence of 3 is three
I took 2 one time as highest number of occurence of 2 is one

That's the traditional algebraic method
However there are other ways too.

Answer 17

@amistre64 he tagged you

Answer 18

becuase 2 is not a 3 :/

Answer 19

3 = 3
2*3 = 6
3*3*3 = 27
3*3 = 9

organizing the primes is just lining up what you have with what you got, and tacking on whats extra.

Answer 20

Holly crap!! I understand it 100% now!!

Answer 21

thanks to all of you.

Answer 22

Welcome

Answer 23

good luck ;)

Answer 24

who wants the medal?

Answer 25

not me ....

Answer 26

give @amistre64 the medal

Answer 27

lol .....

Answer 28

haha

Answer 29

ive got plenty, and im not buying a descriptor

Answer 30

:)

Answer 31

a descriptor?

Answer 32

wait can you explain me the drop down method amistre64?

Answer 33

wait actually, I really only need to know one method right?

Answer 34

knowing more than one method of finding the LCM isn't necessary?

Answer 35

http://www.math.com/school/subject1/lessons/S1U3L3GL.html
No it is not necessary but tag amistre if u want know his method

Answer 36

ok thanks :)

Answer 37

the LCM can be considered as the least number of prime factors, from a pool of prime factors.

if we simply expand a number into its prime factors, and line them up; the least number of prime factors that they have in common is the 'drop down' of the columns.

3 = 3
6 = 3 2
27 = 3 3 3
9 = 3 3
9 = 3 3
---------------
LCM: 3 3 3 2

all the setup does is organize the data.

Answer 38

find the LCM of 3, 8, 12

3 = 3
8 = 222
12 = 3 22
-----------
LCM: 3 222