## 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?

-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:

BubbleShare

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

BubbleShare

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

The next Scribe is.... Austin!