iam 12 yrs old having trouble finding an easy way to find the least common multiple for number pairs.... help

- anonymous

- jamiebookeater

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- anonymous

how can we help?

- anonymous

i just need help with my math its least common multiple

- anonymous

do you have any examples you would like to work on or should we start working on random ones?

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- anonymous

i have one its the least common multiple of 8 and 20 its iether 2 or 4

- anonymous

Ok, are you sure that you are trying to find the least common multiple or the greatest common factor?

- anonymous

least common multiple it says it on the paper my teacher hand this to me and two others and told me i need it in by monday or i fail

- anonymous

ok well least common multiple is a number that is BIGGER than the two numbers you have and both of the numbers you have can be multiplied into it

- anonymous

since 2 and 4 are smaller than both 8 and 20, we know they cannot be LCMs of them

- anonymous

this is all confusing to me

- anonymous

a least common multiple can also be the same as the biggest of the numbers that you have

- anonymous

well lets look at the name itself then:

- anonymous

least means smallest
common means that both relate to it
and multiple means that if you multiply either of the numbers you have, you will get a multiple

- anonymous

so a least common multiple is the smallest number that both of the numbers you have, can fit into a certain amount of times

- anonymous

im just confused becuase i dont get how you find it

- anonymous

and my teacher is no help

- anonymous

ok well we know that it has to be at least the value of the biggest number you have

- anonymous

so lets start their, and after we work through the most basic methods of finding a LCM, we can work on faster methods

- anonymous

there*

- anonymous

so 20 is the bigger of the two numbers (8 and 20)

- anonymous

but 8 doesnt divide into 20 without a remainder or a decimal

- anonymous

ok

- anonymous

so that wont work

- anonymous

why is math so cunfusing

- anonymous

the next one we have is 40, because no number in between 20 and 40 will divide by 20, we have to jump all the way to 40

- anonymous

it isint, it just takes practice

- anonymous

so, is 40 divisible by 8?

- anonymous

yes

- anonymous

then that is your least common multiple, see how we started at 20, because it was the farthest down we can go without being lower than 8 and 20, and because it wasnt divisible by 8 we had to go up, and the next available number that was STILL divisible by 20 was 40, we went to 40, and 40 is divisible by both 20 and 8

- anonymous

ok

- anonymous

now what about 120 and 5

- anonymous

well lets start at 120, because that is the lowest we can go right?

- anonymous

i think

- anonymous

anything lower than 120 will be LESS than our two numbers (120 and 5) so we can NOT go lower than 120

- anonymous

so, we start at 120, is 120 divisible by 5?

- anonymous

yess

- anonymous

there ya go!

- anonymous

wut i have no idea what is going on

- anonymous

ok well do you get why we started at 120?

- anonymous

no

- anonymous

remember the definition of a LCM, it has to be bigger than both of your numbers or the same as the biggest of your numbers

- anonymous

we have 5 and 120, since a LCM has to be bigger than both or equal to the biggest, it has to be at least 120

- anonymous

i still dont get this al the numbers just look like letters to me

- anonymous

literally like letters, or youre just confused?

- anonymous

wait nevermind i wus looking at my english homework

- anonymous

....???

- anonymous

i have alot of homework

- anonymous

well how about we finish math first, since it is more important (you dont want to fail) and since you have me available and i have to go eventually

- anonymous

i have to go right now cuz its 11:00 and i have somewhere to go tomarrow

- anonymous

ok...

- anonymous

so then you dont want to learn how to find LCMs?

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