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.

vicky873

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

Camille873

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

hannah873

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

Alexander8-73

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

Abigail8-73

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

i love the tips and nice post! :)