Multiply Fractions with Decimals | Mathematics | Page 1

safe ore Sep 21, 2023, 1:03 PM

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Photo attached, got no clue on how to do these. Our teacher refuses to post material online and mostl ikely will end up in a class complaint but I still need to learn eitherway.

viscid impBOT Sep 21, 2023, 1:03 PM

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safe ore Photo attached, got no clue on how to do these. Our teacher refuses to post mate...

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hazy patio Sep 21, 2023, 2:03 PM

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hmm

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multiply the numerators then the denominators like any other fractions

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then multiply both numerator and denominator by the same factor of 10 to make it an integer

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if u do the same factor of 10 both up and down it has no effect

safe ore Sep 21, 2023, 2:07 PM

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im struggling sm with this. We arent even allowed calculators

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I will try that and see

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when you say multiply do you mean across, left to right?

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as in normal multiplying of fractions @hazy patio

hazy patio Sep 21, 2023, 2:10 PM

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multiplying normal fractions is like just multiply the numerators then multiply the denominators

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do the same

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here

safe ore Sep 21, 2023, 2:12 PM

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so rn I've got 3.99 / 1.188

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so multiply both by 10

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that would give 39.9, so would I need to multiply by 100?

hazy patio Sep 21, 2023, 2:13 PM

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yes

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but actually 1000

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because u need the numerator to be 1188 too and not 118.8

safe ore Sep 21, 2023, 2:14 PM

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Im trying to do this without a calc so just give me a few

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I dont understand how to do that manualyl but I suppose its just common knowledge to times it by 1000 to make them whole numbers

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so then 399/1188

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how tf would I somplify lol. Divide them in half on their own first?

hazy patio Sep 21, 2023, 2:19 PM

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yes so thats it

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u need to simplify by factors, brute force

safe ore Sep 21, 2023, 2:21 PM

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youll have to forgive me man, not sure what you even mean by that

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I know sometimes you have to estimate

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our teacher is whack so doing my best

hazy patio Sep 21, 2023, 2:22 PM

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oh its alright

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u know how to find factors of a number?

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using the table thing

safe ore Sep 21, 2023, 2:22 PM

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like, lowest common etc?

hazy patio Sep 21, 2023, 2:22 PM

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yes

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find the highest common

safe ore Sep 21, 2023, 2:23 PM

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Kind of, good with low numbers but with these bigger numbers I wouldnt know where to start aside 2 or 3

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but ive always done lowest so I may need to learn

hazy patio Sep 21, 2023, 2:23 PM

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yup, youre supposed to start at 2 or 3 and work your way up

safe ore Sep 21, 2023, 2:24 PM

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but they both have to match so like, how would yo ueven work that out

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is it 199?

hazy patio Sep 21, 2023, 2:30 PM

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the hcf? no

safe ore Sep 21, 2023, 2:32 PM

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I cant even divide it by half cos its a 199.5

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and we arent doing remainders

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im lost my friend

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sorry

hazy patio Sep 21, 2023, 2:32 PM

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hmm im pretty sure u can let it be as is

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and leave it as 399/1188

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or like do by 3 atleast

safe ore Sep 21, 2023, 2:34 PM

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ill try

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3 works

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133

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133/396

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which is also the simpliest form

hazy patio Sep 21, 2023, 2:37 PM

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hmm thats it i think

safe ore Sep 21, 2023, 2:37 PM

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my course is Prep. for Health and Nurse studies

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I cant even fathom why I need to know this

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I did a semester of Uni to get accepted for the coruse I want to do, and this "lower level" course its insanely harder

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I must say thank you though man. I am going to try a few mroe and will message if I need help

hazy patio Sep 21, 2023, 2:38 PM

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alr

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if its done then u can close the thread later

safe ore Sep 21, 2023, 2:39 PM

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I will mate, thank you. WIll I still be avle to see the thread?

hazy patio Sep 21, 2023, 2:39 PM

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after closing? no

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u can let it be if u want

safe ore Sep 21, 2023, 2:45 PM

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I got another one, I just need to know when to stop

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So say if I kept diving it by half to simplify and then I got to a number that didnt work. Then my last answer would be the most simple one

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dividing*

hazy patio Sep 21, 2023, 2:45 PM

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no

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suppose the fraction 9/15

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u can simplify it by 3 but not by 2

safe ore Sep 21, 2023, 2:46 PM

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and its that just knowledge on odd/even numbers right?

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Ive yet to get that in my head, like if the number ends in a 0/23

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0 or 2 *

hazy patio Sep 21, 2023, 2:47 PM

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yes then its evebn

safe ore Sep 21, 2023, 2:47 PM

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so it owuld be a divide by a 2

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but if it ends on an odd number, by 3?

hazy patio Sep 21, 2023, 2:48 PM

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yes

hazy patio Sep 21, 2023, 2:48 PM

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safe ore but if it ends on an odd number, by 3?

then no

safe ore Sep 21, 2023, 2:48 PM

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can you clarify that?

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like how do you mean

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with the no part

hazy patio Sep 21, 2023, 2:57 PM

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hmm

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because if it ends with 3

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its odd

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meaning 2 is not its facyor

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so dividing by it will always give something .5

safe ore Sep 21, 2023, 2:58 PM

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okay so wha would I divide it by to simplify. If it ends in an odd number?

hazy patio Sep 21, 2023, 3:02 PM

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it depends on the denominator and if it has common factors

safe ore Sep 21, 2023, 3:03 PM

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ah okay so theres more to it

#Multiply Fractions with Decimals