Tuesday, November 15, 2011

15/11/10 Math Homework

Homework for math: What is 22 % of 80? And to do pages 36, 37, 38, and 39 in your homework booklet.

What is 22% of 80?

There are a lot of ways you can get to your answer, but..
one way you can find the answer is to...

Step 1 : Find out what 10 % of 80 is.......... the answer is 8.
Step 2 : Do that again, 10% of 80 = 8.
Step 3: Find out what 1% of 80 is .......... it is 0.8
Step 4 : Do that again, 1 % of 80 = 0.8
Step 5 : Add the percentages together ( 10% + 10% + 1% + 1% = 22%)
Step 6: Add the answers together ( 8+8+0.8+0.8 )

The way I first found out my answer was by doing this ( I don't know if this is a correct way of doing it, but I'll just tell you how ) :
Step 1 : Find 25% of 80......You get 20
Step 2 : Find what 1% of 80........ It's 0.8
Step 3 : Again, find what 1% of 80 = 0.8
Step 4 : And again, find what 1% of 80 = 0.8
Step 5 : Add the Percentages, located in the purple "thing". Equals to 3%
Step 6 : Add the decimal numbers in the purple "thing". The answer is 2.4
Step 7 : Do 20 - 2.4 = 17.6, your answer! You're probably thinking where I got 20 from, that was when we did step one.
Step 8 : Lastly, Do 25% - 3% = 22%

Homework Booklet, Page 36, number 2a.

Shade hundred grids to represent each percent ( 3 % ).

Homework Booklet, Page 37, number 3a.

She diagram as a fraction, a decimal, and a percent.

Answer: fraction : 1/4
decimal : 0.25
percent : 25 %

Homework Booklet, Page 38, number 1-4.

Match each sentence beginning in column A to an ending in column B.
1) To represent a percent great than 100%, shade more than one hundred grid.
2) To represent a fractional percent greater than 1, shade squares from a hundred grid to show the whole number and part of one square to show the fraction.
3) To represent a whole percent, shade squares on a grid of 100 squares called a hundred grid.

Homework Booklet, Page 39, number 9 a, b, c, and d.

How many hundred grids are needed to show each of the following percents? Explain your thinking.
9a) For 230%, you would need (3) hundred grids, because (2) hundred grids would be fully colored, and you would still need to color 30%, so 3.

9b) 680% would need (7) hundred grids, you always want to go one grid higher than how much hundreds you have in your number.

9c) 395% ......................... Think about it!................... Your answer, (4) hundred grids.

9d) 1420% Hmm.. Now let's think about that, you would need (15) hundred grids because, like I said in question 9b, " you always want to go one grid higher than how much hundreds you have in your number "
So, in this case, there are 14 hundreds in 1420, so you would go one grid higher, which is 15!

(When I publish this post, none of my colored fonts are showing, so sorry if it looks plain *sigh* )
Harbeck Pen
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11 comments:

  1. Thanks Mary, I was a bit confused about the 22% of 80 but your example helped me. You explained all the notes clearly. Good Job, Mary. (The colored fonts thing happens to my posts to.)

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  2. Thanks Mary! Good job on explaining step by step on how to find the percent and the grid thingy! Haha.

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  3. Hi Mary. Great scribe post! The "22% of 80" is very well explained. Everything is clear. I think you should have added the different percents we did in class: " 50% of 60, 25% of 60, 10% of 60 and etc. "

    Here is a link you could have added to you scribe post : http://www.mathgoodies.com/lessons/vol4/meaning_percent.html

    Good Job Mary!

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  4. Hi mary! You did a good job on your scribe post. Everything was good but when you explained the second way to get 22% of 80, it was kind of confusing. Either than that you did great job.
    Here is a video you should have added though:
    http://www.youtube.com/watch?v=2rr-IXInEVc

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  5. Hi Mary! You did a great job on the scribe post! The "22% of 80" is a bit confusing. But overall, everything was clear.

    Here is a link you could have added to you scribe post : http://www.mathplayground.com/balloon_invaders_percent.html

    Good Job Mary!

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  6. Great job Mary! I liked how you thoroughly explained how you got the answers for each of the questions. You explained the '22% of 80' very well(I used the same method; "25% - 3%") One thing I would suggest is that you include a link or a video or bold some key words.
    So, I also found this great game/link that will give others a practice on percentages:

    http://ca.ixl.com/math/grade-8/percent-of-change-word-problems

    http://ca.ixl.com/math/grade-8/convert-between-percents-fractions-and-decimals

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  7. Fantastic Job Mary! I think you did an excellent job on finishing 2 posts in one day and how the results looked when you finished them. Your answers were very clear and easy to follow, it even helped me! :P. I also like how you gave pictures and bolded some words but i thought you could of bolded key words in you sentences just what like Angela said up there. I also thought you coluld of added a link or a video to help us understand the concept or converting percents and such sort.

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  8. Good job ! I like how you explained everything step by step. The only thing i got confused is when you were explaining 22% Of 80, but overall Everything was clear. Nice job!

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  9. Thanks I know what to do with the 22% of 80.
    I didn't get confused. I thought the First explanation was more clear to me, when you had to just add 10% of 80.
    10% of 80
    1% of 80
    1% of 80

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  10. I like how you explained everything step by step.
    good job :D

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  11. Hi Mary! Good job on your scribe post. I liked how the questions were clearly explained, and how it was organized. I suggest that you put a video up. Here is a video link that might help.

    http://www.youtube.com/watch?v=2rr-IXInEVc

    ReplyDelete