Monday, December 11, 2006

Amy's Scribe Post ; Unit: Percentages [Dec 11, 2006]

Today in class, Mr. Harbeck asked us to shade in on our graphs the following percentages: 1%, 9%, 78%, 1/4 or 0.25, and 134%.

After you shaded them in, it should look like this:



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The next thing we did was Mr. Harbeck asked us to make a grid that represented 500 people.
This grid now represents 500 people (100% = 500):





[Diagrams are shown at the bottom]

He then asked us to show 1%, 5%, 10%, 25%, and 50% of 500.
To get 1%, you divide 500 by 100.
Now to get 5%, you do the same thing but you multiply by 5 after diving 500 by 100.
To get 10%, you can multiply 5% by 2.
You can divide 500 by 100 and multiply by 25 to get 25% or you can divide 50% by 2.
Finally there is 50%. To get 50%, you divide 500 by 2.




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The next thing that we talked about is how fractions can help you by making them equivalent.

ex. If you were using 500 as you total and you were trying to find 50% of 500, it can be written as 50/100 = 250/500 (you multiply both the top and bottom of the fraction by 5)



ex 2. :



Homework:

Tonight's homework is to find 1%, 5%, 10%, 25%, 50%, 75%, and 100% of the 2 numbers that were given: 360 and 58.


You have to show Mr. Harbeck 2 ways of how to find each percent of the 2 numbers. Show all work in your math notebook and draw it on the grids that were provided for you. I will now show you how to get 5% of 360 and 58.


Lets start with 360 first. One way of finding 5% of 360 is that you divide 360 by 100 and multiply by 5. [Image is at the bottom]


The other way of finding 5% of 360 is that you can take 10% and divide it by 2. 10% of 360 = 360 divided by 100 x 10 = 36 divided by 2 = 18. 5% = 18.


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Now that I have finished showing you 2 ways of getting 5% of 360, its time for me to start you off on how to get 5% of 58.

[Image is at the bottom]

You just do the same thing but use 58 instead of using 360 when you dividing by 100. So 58 divided by 100 = 0.58 x 5 = 2.9.

Now the other way of getting 5% of 58 is taking 10% of 58 and divide it by 2. 10% of 58 = 58 divided by 100 x 10 = 2.9.


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Now that I have covered the first three questions (I think) for both numbers, it is now up to you to finish the rest.

Here is a link that may help you on solving percentages:
http://www.mathleague.com/help/percent/percent.htm

If you have any questions, you can ask Mr. Harbeck or use the chatbox && leave comments if I misplaced anything or did something that was incorrect :).

Oh oh oh ! And the next scribe will be Rivka :).

4 comments:

marielleD_ said...

good job amy ! haha you explained the work very well & the pictures too. its worthy of the hall of fame (y) ahha

amyL said...

thank you marielle :)

boeun said...
This comment has been removed by the author.
-rhishz- said...

great job amy! like ur scribe! its easy to understand!