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Mathematics 19 Online
OpenStudy (anonymous):

HELP HELP HELP im having a exam tomorrow and need help please

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

well im really bad at fractions like adding them taking devieding so on

OpenStudy (anonymous):

???

OpenStudy (lgbasallote):

oh gosh fractions o.O i admit this is a pretty hard topic to explain...hmm

OpenStudy (lgbasallote):

i know! give me two fractions

OpenStudy (anonymous):

um 9/68 times 8/68

OpenStudy (amistre64):

multiplication of fractions is just multiplying straight across

OpenStudy (amistre64):

9*8 ------ 68*68 in this case

OpenStudy (anonymous):

no ive been told not if you have the same denoimanter sorry cant spell

OpenStudy (amistre64):

do you want help? or just to argue?

OpenStudy (anonymous):

im sorry were you right?

OpenStudy (amistre64):

yes, i was right. multiplication of fractions is just multiplying them straight across

OpenStudy (amistre64):

\[\frac{a}{m}*\frac{b}{n}=\frac{ab}{mn}\]

OpenStudy (anonymous):

okay so like 8/95 time 5/85 so 8times 5 then 95 times 85

OpenStudy (amistre64):

yes

OpenStudy (amistre64):

they like you to simplify as much as possible, but the value remains the same

OpenStudy (anonymous):

okay thank you now what about if there is a bit number in front like 6 9/8 time 8/9

OpenStudy (amistre64):

a mixed numeral has a big number in front; it tells you how many whole pieces you have; the fraction is the stuff thats remaining think of it as pies or cakes or pizzas; you have 6 whole pizzas and 9 out of 8 pieces left over. to figure out how many pieces of 8 you have; multiply 6 by 8 and add it to the fraction

OpenStudy (amistre64):

in other words, convert the mixed numeral to an improper fraction and then multiply across like usual

OpenStudy (lgbasallote):

very well explanations as usual @amistre64 ^_^

OpenStudy (amistre64):

its a curse lol

OpenStudy (lgbasallote):

ahh yes we all have that curse lol

OpenStudy (anonymous):

so example?

OpenStudy (amistre64):

convert 3 2/5 into an improper fraction for me, just try it out so i can see what your thinking is

OpenStudy (anonymous):

okay one minute

OpenStudy (anonymous):

is it three times 2 or three times five?

OpenStudy (amistre64):

the bottom number is how many peices we want it broken into; so 3 whole "pizzas" cut into 5 pieces each gives us how many pieces?

OpenStudy (anonymous):

15

OpenStudy (amistre64):

good, and we had 2 pieces out of 5 left over to add to it. (15 + 2) pieces of 5s = 17/5 right?

OpenStudy (anonymous):

yep

OpenStudy (amistre64):

3 2/5 = 17/5 now its easier to use with other fractions if we want to add or multiply it to them

OpenStudy (amistre64):

for example; 17/5 * 15/3 would be?

OpenStudy (anonymous):

um :/

OpenStudy (amistre64):

nothings changed as far as the rule goes; multiply top to top, and bottom to bottom

OpenStudy (anonymous):

okay and you just add the left over big nuber not in this case though rite?

OpenStudy (amistre64):

we changed the big number so that it became a part of the fraction. there is another way we could have approached it, but this is a common method to use.

OpenStudy (anonymous):

so for example 2/6 * 6 1/6

OpenStudy (anonymous):

sorry wasnt supposed to send that

OpenStudy (amistre64):

lol, was it illegal?

OpenStudy (anonymous):

huh?

OpenStudy (amistre64):

you said, you werent spose to send that i responded with, was it illegal? i thought that was pretty straight forward ....

OpenStudy (anonymous):

yeah it was

OpenStudy (amistre64):

post up some new questions for people to help you out with and get their opinions on. I have to get back to work :) good luck

OpenStudy (anonymous):

okay thanks

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