Tuesday, January 26, 2010

Eric.P's Percent Scribepost for January 26, 2010

Okay today's homework was to answer the questions 3- 6 to from page 142 in the math text book. Also you can't use a calculator everything has to be done in your head. If you use a calculator Harbeck will kick you in the leg.

So here's how I got question 3 and 4 using my head.
3.

A) To find 300% of 2000 you need to times 2000 by 3 because a percent is always out of 100 and 300% is 3 times larger than 100.

2000 x 3 = 6000
100% x 3 = 300%
6000 = 300%

B) To find 1 and one quarter of a percent of 60 you need to first find 1%. Now that you have 1 percent you can find 1 quarter of a percent by dividing it by 4. Now add both the 1 percent and the one quarter of the percent together to get your answer.

60 / 100 = 0.6
0.6 / 4 = 0.15
0.15 + 0.6 = 0.75
0.75 = 1 and one quarter of a percent.

Tip: For those who had trouble with figuring out 0.6 divided by 4 you can times it by 100 then divide by 4 then divide by 100 to get your answer.

c) To find 0.1% of 40 you need to divide 40 by 1000.
40 / 1000 = 0.04
Tip: Dividing by a number like this that has 1 then a bunch of zeros you can just move the decimal place left by how many zeros there are.

4.
A) To find 20% of 60 you need to divide 60 by 5. I will explain why you do this since 20% is 5 times smaller than 100% you will need to divide 60 by 5.
60 / 5 = 12

Tip: Another way to do this is to divide by 10 then times 2. You can do this because 100% divided by 10 is 10% then times 2 is 20%.

B) To find 250% of 400 you need to first times 400 by 2 to get 200%. Still using your 400 divide it by 2to get 50% add the 2 and you will get your answer.

400 x 2 = 800
400 / 2 = 200
800 + 200 = 1000

c) To find 10 and a half of a percent of 100 you need to first find 10% of 100. To find 10% just divide by 10. Now you need to find half a percent first with the 10% you have divide that by 10 again to get 1% now with that divide the 1% in half to get the half of a percent. Now add the 10% and the half of a percent together to get your answer.

100/ 10 = 10
10 / 10 = 1
1 / 2 = 0.5
10 + 0.5 = 10.5
If I messed up or something comment and tell me.

6 comments:

vicky873 January 27, 2010 at 6:02 PM  

Good job Eric. It was all good and accurate. Good job on posting the picture of the questions.

Camille873 January 27, 2010 at 6:18 PM  

good job eric you explained it very well. and thanks for putting a picture there. (:

hannah873 January 27, 2010 at 6:52 PM  

Good job. You actually explained each one very well. You even gave a tip to make things easier to understand.

Alexander8-73 January 31, 2010 at 7:43 PM  

Nice job Eric I like how you used the change or color for the important part.

Abigail8-73 February 2, 2010 at 11:07 PM  

Good job Eric! (: I like how you change the colors for the important sections,and I found this one funny " If you use a calculator Harbeck will kick you in the leg." LOL anyways, I like the picture and I also like how you give advise/ tips. (: Well Done! (:

kaitlin.L 8-73 February 3, 2010 at 6:17 PM  

i love the tips and nice post! :)

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