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Mathematics 10 Online
OpenStudy (anonymous):

I NEED HELP ON DIVIDING fractions

OpenStudy (anonymous):

i need help

OpenStudy (anonymous):

post ur question then

OpenStudy (anonymous):

ok 2/3 5/4 adding them

OpenStudy (anonymous):

u there

OpenStudy (anonymous):

First thing you have to do in order to add fractions is get a common denominator. Do you know how to do this?

OpenStudy (anonymous):

yea but not how to divide it

OpenStudy (anonymous):

You don't need to divide. What is the lowest common multiple of 3 and 4?

OpenStudy (anonymous):

2 or 1

OpenStudy (anonymous):

can either of those be divided evenly by 3 or 4? What about 12? 12 is divisible by both 3 and 4.

OpenStudy (anonymous):

So we need a 12 on the bottom of both fractions. for 2/3 we multiply both the top and bottom by 4. Do a similar thing to the second fraction. Now you can add

OpenStudy (anonymous):

|dw:1352428038374:dw|yea so i do that and

OpenStudy (anonymous):

hello there

OpenStudy (anonymous):

\[{2\over3}+{5\over4}\]to add these you need denominators that are the same so we are going to multiply \(2\over3\) by \(4\over4\) which is the same thing as multiplying by one but gives us the denominator of \(12\) which is the common denominator. Similarly we will multiply \(5\over4\) by \(3\over3\) to again have a denominator of \(12\) to be able to add these: so lets do so:\[\left({4\over4}\times{2\over3}\right)+\left({3\over3}\times{5\over4}\right)\]so multiplying gives us:\[{8\over12}+{15\over12}\]now we can add the numerators (the denominators remain the same):\[\large23\over\large12\] hope this helps! :)

OpenStudy (anonymous):

thx are u a girl or boy

OpenStudy (anonymous):

basically the rule is to have a 'common denominator' to be able to add two or more fractions, which means to have a number in the denominator that all of the denominators can multiply into. :)

OpenStudy (anonymous):

thats not important ;)

OpenStudy (anonymous):

|dw:1352669265890:dw|

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