Wednesday, December 06, 2006

Jizake's Scribe Post - Mitosis

Today in class, we first opened up our booklets and wrote down:

What does 30% mean?
The class answers were :

-part of 100%
-30 out of 100
-30% = o.3
-less than 1/2 or 50%
-3:7
-30/100 is 30%
-3/10 is 30%
-And as shown as a picture:

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We then corrected our homework from yesterday.

We had to use 400 and 162, and find the following percentages:

1% of 400

5% of 400

10% of 400

30% of 400

65% of 400

85% of 400


1% of 162

5% of 162

10% of 162

30% of 162

65% of 162

85% of 162

So first, we have to find out what 1% of 400 is.

To find what 1% is, we divide 400 by 100 and multiply the answer by the percentage you're trying to find. In this matter it's 1%.
400/100 = 4 * 1 = 4. Once we know what 1% of 400 is, everything gets easier.

5% of 400

Since we know what 1% of 400 is. We could just multiply 4 by 5.
4 * 5 = 20. That means 5% of 400 is 20. To show your work.
you can show it like this:

400/100 = 4 *5 = 20 or 4*5
= 20 or 5/100 = 0.05 * 400 = 20

10% of 400 = 4 * 10 = 40.

30% of 400 = 4 * 30 = 120.

65% of 400 = 4 * 65 = 260

85% of 400 = 4 * 85 = 340


In this case the whole 10x10 grid which is 100% is = to 400 because that is the total. That means each square in the grid below has a different value than the value of each square out of a total of 100. ex. 1% of 100 = 1 . So the value of each square in the grid below is 4.



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162 is also done the same was as 400

1% of 162 = 162/100 * 1 = 1.62 or 1/100 = 0.01 * 162 = 1.62

5% of 162 = 1.62 * 5 = 8.1

10% of 162 = 1.62 * 10 = 16.2

30% of 162 = 1.62 * 30 = 48.6

65% of 162 = 1.62 * 65 = 105.3

85% of 162 = 1.62 * 85 = 137.7


Now in this scenario the 100% is = to 162 because 162 is now the total. Now each square is worth 1.62 which is 1% of 162



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We then corrected:

What is 45% of 60?

21% of 78

35% of 18

91% of 210

55% of 370

12% of 125

70% of 256

To find what is 45% of 60. First you have to divide 60 by 100. Which gives you 0.6.
0.6 is 1% of 60. Now that we have what is 1% of 60. We multiply 0.6 by 45. which gives us 27.

21% of 78 = 78/100 = 0.78 * 21 = 16.38

35% of 18 = 18/100 = 0.18 * 35 = 6.3

91% of 210 = 210/100 = 2.1 * 91 = 191.1

55% of 370 = 370/100 = 3.7 * 55 = 203.5

12% of 125 = 125/100 = 1.25 * 12 = 15

70% of 256 = 256/100 = 2.56 * 70 = 179.2


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Our homework today is...

Use calculators and grids to do the following:


60% of 70
32% of 50
40% of 123
3% of 560
19% of 144
75% of 450
54% of 80
63% of 110
15% of 900
91% of 12

Here are some helpful links on this ummmm... percent as you call it:

http://www.bbc.co.uk/schools/revisewise/maths/number/03_act.shtml

http://www.mathleague.com/help/percent/percent.htm

And i commented this scribe post:

http://apcalc06.blogspot.com/2006/11/scribe-post-day-52.html

Alright... leave a comment if i did something wrong?

The next Scribe is.... Austin!

2 comments:

shawnjay. said...

Great scribe post jake !! The detail on all the things we did today were very clear and good job on the bubbleshare visuals. You forgot one thing though.. you need to have websites with information on whatever we did today which was percentages and you also have to have a website that leads to a scribe which commented on. Overall this is a Very Good Scribe Post!

Mr. H said...

Shawn left a great comment. This is an excellent scribe. Your bubbleshare is superb. This is destined for the Hall of Fame. I appreciate the effort you put into this post.

Harbeck