Sunday, September 27, 2009

Scribepost for September 23, 2009

Question #9:



The graphs show the categories of books that were signed out from a library over a year.










a) Estimate how many times more popular science fiction books are than history books.


The science fiction books are 24% more popular than the history books.


b) Which graph helped you answer part a)? Why did you choose this
graph?

The graph that I used to help me
answer part a) was the the circle graph. I chose the circle graph because the percents are already there instead of using the bar graph. Because with bar graph, I still need to convert the numbers into percents and then do the subtracting.


c) Which category of books has approximately the same number of sign outs as history and sports books together? Show your thinking.


Mystery has the same number of sign outs as sports and history put together. I got that because if you add up all the sports books and history books you will get the same number of sign outs as the mystery books.



d) Which graph helped you answer part c)? Why did you choose this graph?

The graph that helped me answer part c) was the circle graph because you could easily see that the percent of history (10%) and the percent of sports (13%) are equal to the percent of mystery books (23%). I chose to use the circle graph because the percents were easier to work with than the bar graph because with the bar graph you will have a hard time trying to find the exact number because of h
ow high the intervals are.


e) The library has $12 000 to spend on books based on their popularity. How much money should be spent for each category? Show your work.


History: $1 200

Sports: $ 1 560

Teen Romance: $ 2 400
Mystery: $ 2 760
Science Fiction: $ 4 080

I got those answers by using a ratio table, by finding 1% and then multiplying it by the other percents.





















f) Which graph did you use to answer part e)? Why did you choose this graph?

I used the circle graph to answer part e). I chose it because I found 1% and then just multiplied it by the other percents but if I used the bar graph I would have to work harder to get the same answer and do many more steps.

11 comments:

Brayden817 said...

Good Job ! I like how you used different colours for every question. I didn't notice any grammar/spelling errors. I noticed that some words weren't spaced out.

MaryJane817 said...

Great job ! Everything was well organized. The pictures were nice and the answers were clearly done. The colors you used for each question was a nice touch.

april817 said...

Gooood Job Elaine! It was very neat and organized, I liked everything about it! :D

Marielle 8-17 said...

Elaine, this post was done really good ! I liked how you used different colors for each questions. It's really understandable :)

Jex (Juan Exequiel)8-17 said...

Awesome job Elaine. I like how everything was organize I also like how you used color and it was easy to understand.

Mr Montgomery said...

Hi Elaine

Mr Montgomery here. I teach maths to kids your age in Perth Western Australia.

Thanks for taking the time to write in your blog. I'm sure Mr Harbeck appreciates it.

That's an interesting use of a ratio table. I've never seen it used like that before.

Darlene8-17 said...

Wow, great job on your scribe post ! You used many different colors ! It stands out really well . ! And everything seems to be organized pretty well ! Great job again ! =)

Allysa8-17 said...

GREAT JOB ELAINE! I like how you used different colors for each of the questions. I also like how you showed how you used the ratio table and put in the picture. I don't think i saw any problems or places to improve in. Anyway, good job and keep up the good work!

||justine817|| said...
This comment has been removed by the author.
||justine817|| said...

good job !! , i really understand what u were talking about xDD

ammorn said...

Nice job Elaine ! I really like your scribe its very colorful and it stands out great ! You also explained everything pretty well !

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