I am really stuck on this question, Can someone please help me????

- anonymous

I am really stuck on this question, Can someone please help me????

- Stacey Warren - Expert brainly.com

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- anonymous

what question is that?

- anonymous

I am trying to add a fraction that has a different denominator, but am trying to figure out how do you know when to change the numerator???

- anonymous

give an example.

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- anonymous

1/4 + 3/10 + 2/5, now is no the LCD is 20, now my question is how do I change to numerator???

- anonymous

Or how do I know when to change it???

- anonymous

alright, do you notice something about the fractions 1/2 and 5/10?

- anonymous

yes that they are equivalent!!!!

- anonymous

okay good. so 5/10 is basically 1/2 multiplied by 5 on both numerator and denominator correct?

- anonymous

Ok so when adding fractions together I basically find the multiple of the denominator and make it the numerator. Example, 1/4 + 2/5 + 3/10 change to 5/20 + 10/20 + 6/20?

- anonymous

are you sure 2/5 is the same as 10/20?

- anonymous

My mistake 2/5 will be 8/20... right?

- anonymous

right. now, all your fractions have a common denominator. so you can add up all the numerators.

- anonymous

I really am not getting this numerator and denominator part. Because I know am mutiplying right but my answer isn't corresponding with the answer in my book!!!!

- anonymous

the answer should be 19/20

- anonymous

Its right, but am trying to make sure I understand how to change the numerator when you find the LCD to the problem!!!!! Are their any rules to changing the numerator to a problem???

- anonymous

Suppose you had a pizza. Suppose the delivery guy had cut it into 6 equal parts. you paid the pizza guy 10 dollars for your pizza. Now lets say you wanted to share the pizza with me since you can't finish it all on your own. Suppose I paid you 3 dollars. How much pizza should I get?

- anonymous

Just give me one second am working it out!!!!

- anonymous

take your time.

- anonymous

Am not sure how to work this problem... I really thank you for spending you time trying to help me with this problem am having!!!!

- anonymous

no problem. Let me explain. your pizza costs 10 dollars. I said I will pay you 3 dollars for my share of the pizza. now suppose instead of cutting the pizza in 6 pieces, the delivery guy had cut it into ten pieces. Then I would get 3 pieces, because there are totally 10 pieces, so each piece is worth 1 dollar. Are you with me so far?

- anonymous

Yes

- anonymous

Okay, good. But the problem is that the pizza guy cut it into 6 pieces. So how do I get my fair share and how do you get your fair share?

- anonymous

so, I should get three-tenths of the pizza because I paid 3 dollars for it. right?

- anonymous

yes

- anonymous

Okay, so what I am going to do is cut up each of the 6 pieces into 5 smaller pieces, so that we have 30 total pieces. then three-tenths of 30 pieces is 9. So, I would get 9 of the smaller pieces.

- anonymous

Okay do you mind giving me a call, Because I am so lost!!!!

- anonymous

If you dont mind my number is 773 414 7155 thanks

- anonymous

What did you not understand in this example?

- anonymous

Try considering when you multiply a denominator like the ones you have, say 4/5 to 8/10. The number cannot be changed so technically you are multiplying the fraction by 1. (4/5) * (2/2) = 8/10. In your case (1/4)*(5/5) = 5/20, (2/5)*(4/4)= 8/20, then you have the last one, and any other fraction you need to get a common denominator for. Remember you cannot just up and change any number's value, but you can change the way it looks. Multiply by 1. (sorry to but in by the way. I just wanted to see what the question you had actually was.)

- anonymous

http://www.dabbleboard.com/draw?b=Guest645290&i=0&c=3f49f5a056475207455ee8e98a3fdabbea0850cb
khiyah join me there I will be able to explain it better

- anonymous

ok

- anonymous

so 2/5 means that out of 5 pieces, you have 2 pieces,
or that out of 20 pieces, you have 8 pieces, since 2/5=8/20
or that out of 40 pieces, you have 16 pieces. since 2/5 = 16/40

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