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Mathematics 7 Online
OpenStudy (rebeccapink6398):

pls help with fractions XD

OpenStudy (rebeccapink6398):

OpenStudy (rebeccapink6398):

@MeganLeex3

OpenStudy (rebeccapink6398):

@AnyOneElseThatWillHelpMe XD

OpenStudy (anonymous):

i believe 4

OpenStudy (anonymous):

\[4\div \frac{5}{8}=4\times \frac{8}{5}\]

OpenStudy (anonymous):

multiply straight across \[4\div \frac{5}{8}=4\times \frac{8}{5}=\frac{32}{5}\] then turn it in to a mixed number if you like

OpenStudy (rebeccapink6398):

i dont get it... i understand everyone but @satellite73 , can you help me ... aka explain it differntly :)

OpenStudy (rebeccapink6398):

@MeganLeex3 how did you get yoour answeer?

OpenStudy (anonymous):

ok i can try

OpenStudy (anonymous):

you drink \(\frac{5}{8}\) gallon per day right?

OpenStudy (anonymous):

this is where you say "yeah right, that is what is says"

OpenStudy (rebeccapink6398):

yeah :)

OpenStudy (anonymous):

ok good

OpenStudy (anonymous):

so the question is asking how many 5/8 portions of milk are in four gallons total

OpenStudy (anonymous):

another way to say this is "how many times does 5/8 go in to 4" or in math what is \(4\div \frac{5}{8}\) so far so good?

OpenStudy (rebeccapink6398):

yas :D

OpenStudy (anonymous):

ok so how do you divide a number by a fraction?

OpenStudy (rebeccapink6398):

umm to be honest i have never learned how... do you make it into a decimal first?

OpenStudy (anonymous):

oh no dear

OpenStudy (rebeccapink6398):

...

OpenStudy (anonymous):

this is an exercise in fractions not decimals you divide by a fraction by "multiplying by the reciprocal"

OpenStudy (anonymous):

for example \[12\div \frac{3}{2}=12\times \frac{2}{3}\]

OpenStudy (anonymous):

in your example you want to divide \(4\) by \(\frac{5}{8}\) you do it by multiplying \(4\) by the reciprocal of \(\frac{5}{8}\) which is \(\frac{8}{5}\)

OpenStudy (rebeccapink6398):

soooo 4*8 and then 4*5???

OpenStudy (anonymous):

not quite \[4\times 8\] which gives \(32\) then \(32\div 5\)

OpenStudy (anonymous):

\[4\times \frac{8}{5}=\frac{4\times 8}{5}\]

OpenStudy (anonymous):

multiply means multiply in the numerator, not the denominator

OpenStudy (anonymous):

if you like \[4\times \frac{8}{5}=\frac{4}{1}\times \frac{8}{5}\] multiply straight across

OpenStudy (rebeccapink6398):

oh. mkay so its like times the numerator and then divided by the denominator?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

once you get \(\frac{32}{5}\) i guess you have to turn it in to a mixed number

OpenStudy (anonymous):

do you know how to do that?

OpenStudy (rebeccapink6398):

nu... i am very new to fractions :(

OpenStudy (anonymous):

how many times does 5 go in to 32?

OpenStudy (anonymous):

or better yet, how many times does 5 go in to 30?

OpenStudy (rebeccapink6398):

6 times

OpenStudy (rebeccapink6398):

@satellite73

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