Tuesday, January 31, 2006

jan. 31 ; scribbing`

Tuesday's scribe is now dhona.

Math: January 31st, 2006 Period 2

What we learned in today's class were how to deal with 2 integers in a set of brackets. We did examples that helped us fully understand the concept. Adding and subtracting integers is simple, you only have 3 rules to follow. They are:
1.) Order of Operations, only 1 integer per set of brackets.
2.) After you have cleaned up the brackets pull down the free floating sign
3.) Change your -(-) or owe owes,

Example:
1.) ( - 9 - 3 ) -15
----------------------------------------------------
2.) -12 -15= - 27
----------------------------------------------------
In step two you just do what you normally do with integers, -9 ( owe 9) -3 (owe 3) Together you owe -12. Then you bring down the free floating sign and the number in this case, 15. You must write the answer on the second line. If you put it on the first line, it wouldn't be correct. You now have owe 12 and owe 15, together you owe 27. There is also another set of brackets that we used. They are [ ]. That means that all the number in that one has to be done even if they have a million brackets in it.

Example:
1.) [ ( - 4 ) + ( - 2 ) ] - (- 3)
------------------------------------------------
2.) -6 + 3 = -3
------------------------------------------------

Here we have [ ] and ( ). All you have to do is the operation inside the square brackets. That would be owe 4 owe 2= owe 6. Since the 3 is an -(-) you change that to a + sign and bring it down. Now bring the 3, your equation reads
- 6 + 3 = - 3.

This concept is simple to understand after you get used to it. At first it can be very tricky. This is just like order of operations that we did in grade seven. It is now just with integers.

Homework is half of the questions on the 4th page in the pun book, both sections and finish all the question in part two, the first page of book b. Then, the second page, questions 1-10.

Tomorrow's scribe is Yvanne cause I took over for her today.




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Monday, January 30, 2006

Time To Scribe

Scribes in Mesopotamia used a stylus and clay tablet to keep track of may things. If you are the blog scribe you are to do the same for math class.

So... when it's your turn to be scribe, try answering these questions in your blog:

What did we do in class today?
What did we learn during these activities?
Was this new information or something I've seen in math or another class before?
Was the material difficult or easy to understand?
Is there something that I still don't understand and could ask my classmates to explain?
Did anything else happen during class that would be fun to keep a record of?
Are there any links out there to explain the concepts taight in class?

When you are done your post please pick another student to be tomorrows scribe.
Make this a fun assignment.

How much effort you put in it is up to you.

Mr. H

The Scribe for Tuesday's class will be Yvanne.




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Tuesday, January 24, 2006

math quiz corrections`

The steps are:
()Write the question
()Make a simple sentence
()Write a word ratio
()Make 2 equivalent ratios
Part/Whole = %/100
()Answer the question

My question I got right:
Fifty-six pounds in what percent of 140 pounds?

56 lbs. is _____% of 140 lbs.

140 is the whole
56 is the part

The ratio would be:
pounds given/total pounds = ?/100.
56 x 100/140 = 40%

56 lbs. is 40% of 140 lbs.

My question that I got wrong is:
Your employer has 600 business cars printed for you and you give away 280 of them. To the nearest hundredth, what percent of the cards is left?

____ cards were left.

The wrong answer:
600 is the total amount of cards (whole) and 280 is the part:
cards given/total cards = 280/600 = /100%. It would be 280 x 100/600 = 47.67%

My mistake was I didn't subtract 280 from 600 to get 320. Since, 280 is the cards given, I needed to find out the cards left. 600-280 = 320

The right answer:
cards left/total cards = 320/600 = /100%. It would be 320 x 100/600 = 53%

There are 53% of the cards left.




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annalyns precent quiz things

Here is the question that i got wrong.

1. Underline the question 2. Make a simple sentence 3. Write a word ratio 4. make 2 more equivalent ratios 5. Then fill in the simple sentence or answer it.

A questions i got right . On an arithmetic test Joh recieved a grade of 80%. He solved 24 problems correctly. How many problems were on the test?

What i did : There were _____ problems on the test. for the word ratio i put correct/all problems. Then i put 24/___ and another equivalent fraction was 80/100. Then i multiplied 24 by 100 and i diveded that by 80 and i got 30. So the answer is 30. There were 30 problems on the test.

A question i got wrong A televison is on sale for $600. If the sale price is 20% less than the regular price. What was the regular price ?

My mistake : i put ___/600 and the other equivalent fraction was 20/100 . I multiplied 20 x 600 and i divided by 100 and i got 120 . Then after i got that i added 120 to 600 and the answer i got was $720.

My correction : i put 600/ _____ and the other equivalent fraction was 80/100 not 20 because we're finding the regular price not the discount. Then i multiplied 600 by 100 and divded it by 80 and i got $750. So the right answer is $750. Using a simple sentence : The regular price of the tv is $750.


(I'll answer the other blogs soon sry if it'll be late though)




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Sunday, January 22, 2006

Example of a Percent Quiz post for Jan 23-27

1. To successfully do percent problems you need to know the following:

1. What is the question.
2. Answer the question using a simple sentence answer (using a blank for an answer)
3. What is the part and the whole? Create a word ratio.
4. Set up a proportion that looks like this part/whole = %/100%
5. The last step is to ask myself does my answer look right? If it does I can use the cross products to check if my answer is correct!

Correct Question
On an aritmetic test John received a grade of 80% He solved 24 problems correctly. How many questions were there on test?

John's test was out of __________.

On an aritmetic test John received a grade of 80% (The percent) He solved 24 problems correctly(The part because it is not the complete test!!). How many questions were there on test?

The word ratio is
questions correct/total questions
24/? = 80%/100 b therefore 24 x 100/80 = 30
There are 30 questions on the test. (30 x 80 = 24 x 100)



A question I got wrong was
The original price of the sofa was $500 It is now on sale for $440. What was the percent decrease?

The percent decrease was _______.

The original price of the sofa was $500(The whole) It is now on sale for $440(The Part). What was the percent decrease (The UNKOWN)?

sale price/origional price = percent of sale $ /100% 440/500 =88%/100%

My Mistake was to say the 88% was the percent decrease. I needed to subtract the 88 from 100 to get a difference of 12%. There fore the percent decrease between the sale and origional price is 12%.

This is an example of what your post can look like. Please restrict your use of colour to one and its use is to show important ideas inside your post.

Work hard and make this post work. Comment on other peoples work. If they are confused and cannot answer their question show them how. We all must work as a community.

Post away.

Anon or Mr. H




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Monday, January 16, 2006

answers from melissa

In theatre 1 there is 270 seats in theatre 2 there is 340 seats and in theatre 3 there is 190 seats




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Here is Mr. H's Percent Problem

The problem I found is this

A 800 seat multiplex is divided into 3 theatres. There are 270 seats in Theatre 1, and there are 150 more seats in Theatre 2 than in Theatre 3. How many seats are in Theatre 2?


Please post an answer by placing it in my comments.

Did you get the right answer?

The solution can be found here



A great tutorial on how to solve percent problems.percent questions.

Good luck

Mr. H




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Sunday, January 15, 2006

The 13th Math answers

1) What are those problem solving techniques that I was just talking about???
Well..i don't have my notes right now...i'm not at my house..but i still kind of remember (my memory's not that good :S)
*from the whole problem..underline the question (or somehow make it standout)
*make a simple sentence with a blank
*create a word ratio
*answer the following ratios (there's two more)
*answer it (fill in the blank)

2.Haley has enlarged a 3" by 5" picture so the length and the width are tripled. By what number must the original area of the picture to get the enlarged area ?

Haley would need to enlarge the picture ______ times

Since Haley has a 3" by 5" picture and both has to be tripled....it would then be:
3x3= 9
5x3=15

to get the area you would need to get the product of the length and width...
9x15=135

now to get to answer the main question... 135/15 <--------(15; because this was the area of the original picture size) would then equal to 9.....to make sure of this answer we go 9 x 15 = "135"

now we fill in the blank....

Haley would need to enlarge the picture 9 times

3.If there are 35 students in a class with the ratio 3:4, how many more girls then boys?

There are ________ many girls compared to boys.

In this problem it shows there are 3 boys for every 4 girls....a total of 7 all together... if you divide 35/7 = 5

to tell you the truth, i would stop here already...i gots my answer.. this is my simple way of answering this....it still gives you your answer doesn't it??

but oh well...ill do this the long way..to make everyone happy =)

well anyways....

35/7 = 5.... now you take the 5 and multiply it with 3 which would then become 15....you take 5 again and multiply it with 4 which would give you an answer of 20...20-15=5

see any which way...it gives you the same answer =)

oh i hope i did this right :S




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answers from laramae 2

Lucky 13 Assignment:

The steps are :

1. find the question
2. answer it with a simple sentence
3. create a ratio
4. answer it


Haley has enlarged a 3" by 5" picture so the length and the width are tripled.
By what number must the original area of the picture to get the enlarged area ?
The picture would be enlarged __ times

[] you would multiply 3 by 3 since you want to get the length and width enlarged 3 times and same with the 5 multiply it by 3.
5x3=15
3x3=9
[] when you multiply 15 by 9 you would get 135
[] now you would divide 135 by 15 which is the original area
135÷15=9
[] The picture would be enlarged 9 times

If there are 35 students in a class with the ratio 3:4, how many more girls then boys?

[] 3:4 ratio means that there 3 boys for every 4 girls
[] to get the number of boys, add 3 and 4 which 7
[] then divide 35 by 7 , 35
÷7= 5
[] when you get the 5 multiply it by 3 which will give you 15
[] there are 15 boys
[] since you multiplied the boy's number by 5 you will do the same with the girls
[] 4x5=20
[]there are 20 girls
[] subtract 15 to 20 and you will get 5
Meaning, there are 5 more girls than boys

Percent Problems

1. Sami decided to park her car at Park&Go for her four-day trip. The cost is usually
$8 per day or partial day. However, Sami has a 20% discount coupon for her entire
bill. How much did Sami’s parking cost?
[] We know that four days will cost her $32.00 because 4x8=32
[] First you find 10% of $32.00
10% of 32 is 3.2
3.2 x2 = 6.4
[] So, 20 % of $32.00 is $6.40

2. Yemi used 5 by 5 grid for each of the letters name in her name. what percent of the total number of unit squares in the five grids are shaded? Express your answer in nearest tenth.
[] first grid has 7 squares shaded out of 25
[] 7
÷25=0.28 x100=28
[] second grid has 15 squares shaded out of 25
[] 15
÷25=0.6x100=60
[] third grid has 13 squares shade out of 25
[] 13
÷25= 0.52x100= 52
[] fourth grid has 14 squares shaded out of 25
[] 14
÷25=0.56x100=56
[] fifth grid has 13 squares shaded out of 25
[] 13
÷25=0.52x100=52
[]add all the square shaded
[]7+15+13+14+13=62
[] 62 divided by 125 which gives you 0.496 but you know that's not a happy number so you multiply by 100 which gives you 49.6 and round it off to the nearest tenth gives you 50

[] There would be 50% are the total of number of squares shaded from all the five grids













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Friday, January 13, 2006

jan.13th; answers`

1. The steps are:
()Make a simple sentence
()Create a word ratio
()Answer it

2.Simple Sentence; How much times does Hayley need to enlarge the picture?
---Hayley would enlarge the picture ____ times.
()The sides of the picture equal to 15 because 3"x5"= 15"
()Since the sides are tripled you multiply each by 3
()3x3=9 ; 5x3=15
()When you multiply 15x9 it will give you 135 which is the new area of the picture
()Now, you divide 135 by the original area of 15 and you should get 9 ; 135/15=9
---Hayley would enlarge the picture 9 times.

3.Simple Sentence; If there are 35 students in a class with the ratio 3:4, how many more girls then boys?
---There are _______ more girls then boys.
()Since there are 3 boys for every 4 girls, you add the 3 and because it will give you how much students are in that statment
()Then, you divide 35 by 7 which will give you 5 ; 35/7=5
()Now you multiply 5 by 3 which will give you the total amount of boys ; 5x3=15
()Same with the girls, multiply 5 by 4 and that is 20 ; 5x4=20
()Subtract 20 by 15 which will give you 5 ; 20-15=5
---There are 5 more girls then boys.

``Percent Problems

1. Since it is a four-day trip and it is $8.00 a day. The operation would be; 4x8 which is equal to 32.
---Sami's parking bill only cost $____.
10% of 32 = 3.2
10%x2= 20%
3.2x2=6.4
So 20% of $32.00 is $6.40
You subtract $6.40 from $32.00 which is $26.60 ; $32.00-$6.40=$26.60
---Sami's parking bill only cost $26.60

2. To start, the operation is the grid sides 5x5 and the total squares so it is 5x5x5
The answer to that is 125
There are 62 shaded unit squares
So since all 5 grids are 125 when 100% shaded
100%=125 ;
You divide 62 by 125 ; 62/125=.496
Multiply by 100 ; .496x100=49.6
You round that to be 50%
--- about 50% is shaded.
--() I write alot*








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Thursday, January 12, 2006

I'm Impressed

WOW!! What a wonderful job some of you are doing in this blog. It is really amazing to see so many of you taking this blogging very seriously. It is always amazing to see students share there ideas about number so openly. Keep up the great work.




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Wednesday, January 11, 2006

What An Awesome Job

I would tell you guys what you need to do at the blog but you are doing an excepional job. Incase some one in the future wants to know what to do I will leave this post.

I am very impressed with your ablility to figure out blogging. Some of you are confused about what you are supposed to do.

When you enter your blog space create a post that answers any questions that are being asked. I will post one every week. If you are the class scribe you need to tell the class what happened in class that day
-what concepts were being taught
-give examples to help explain what was going on.
-find links to sites that are helpful to your math understanding.

You can read your classes blogs and leave comments so that they can get help from you.

Remember this is a public space and an extention of the classroom. Act and write appropriately.



Previous assignments That can be done. Lets Try Something New


Have fun

Mr. H




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answers`

Discount is what you save.
Sale Price is what you pay for.

Discount example:
A shirt for $29.99 with 40% off.
40% to a decimal is 0.4;
0.4x29.99= 11.99
Your discount is $11.99

Sale price example:
10% off a CD for $19.99
Since a percent is out of 100, you take away 10 from 100. You will have 90 as an answer. That is the percent you pay. 90% as a decimal is 0.9;
0.9x19.99=17.99
You pay $17.99

Percents:
50% of 70 is 35 because if you want to find 50% of any number you simply divide by 2.

35% of 80 is 28 because 25% is 20 because you can divide 80 by 4 or you can do this: (.25x80=20)
Now you need 10% more since 35-25=10. 10% of 80 is 8 because you divide by 10.
Add the numbers 20 and 8. You should have an answer of 28.








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answers from laramae.

what's the difference between discount and sale price ?
well discount is a reduction in the cost of an item and sale price of an item is its regular price minus the discount. So, in short form, discount is what you save and sale price is what you pay. We're most likely to use discount and sale price for shopping, obviously.

example :

lets say you bought a digital camera for $200.00 and you get a 30 % discount.
To get the 30% : change the 30% into a decimal which means dividing by 100 which gives you 0.3
0.3 x $ 200.00 = $60.00
$200.00 - $ 60.00 = $140.00
Therefore you pay $140.00

what's 50% of 70 ?
to calculate 50 % you divide by 2 or cutting it in half.

70÷2=35

50% of 70 is 35
what's 35% of 80 ?

50 % is 40
10 % is 8
5 % is 4
40 - 8 - 4 = 28
Therefore 35 % of 80 is 28 .

So uhhh .. gets? i get it = D






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math answers from banannalyn

discount is what you save and sale price is the amount u pay.

you calculate discount like this... lets say you're buying a couch for 400 dollars and theres a SALE u get to save 20%. to calculate how much you save u just multiply $400.00 x .2 = $80 so you save 80 dollars on buying your couch.

u calculate sale price by subtracting $400.00 by $80.00 400.00-80.00 = 320 .. so the amount you pay is 320 dollars but that's not including tax .. i'll do that next time :P

50% of 70 is 35 bcause u juss divide by two

first you have to find 25% of 80 which is 20. Then you subtract 35 by 25 which equals to 10 .. now u need to find 10% of 80 and thats 8 .. then you add 20 and 8 and that gets u to 28. So in that case that means that 35% of 80 is 28 0o0o0o im good (: lol




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My Math Answers =)

Question what is the difference between Discount and Sale Price?
Discount is what you save, and sale price is what you pay.

How do you calculate these two amounts?
example question - You get a 50% discount on a $30.00 pair of shoes....
DISCOUNT- .50 x 30.00 = 15.00.... $15.00 is your discount
SALE PRICE- 30.00 - 15.00 (discount) = 15.00.... $15.00 is also your sale price

How do you calculate mentally percentages without going insane?
you should take a happy number first and start from there, then work your way through....for example:

What is 50% of 70?
you should already know the answer to this one.....70 divided by 2 equals 35...
it's that simple!

What is 35% of 80?
now here you have to use the happy number stradegy (or as i would call it anyways)
firstly you go take an easy number to work with...maybe 25%
25% of 80 is 20
now you go: 35 - 25 = 10
and so now you must find 10% of 80....which should be 8
and now you should add 20 and 8 which should equal 28
your answer to this solution is 28

hmmm..well i didn't go insane on that, that's my way of figuring this out =)




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Think before you type!!

Before you create your first post please read the following at this blog. It is really important to think about what you are about to do and all of its consequences.

Read Me Please


Mr. H




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Monday, January 09, 2006

You call this homework!

Welcome to your first classroom blog. You will be asked to talk math to your classmates. Here you find links that will provide math help, ask classmates about math problems and discuss what happened in Mathland that day.

Question what is the difference between Discount and Sale Price? How do you calculate these two amounts?

How do you calculate mentally percetages without going insane.
What is 50% of 70?
What is 35% of 80?

Help me and the rest of the world!!

Mr. H

Try this cool game out



Cubeoban is a fun game that is played by pushing and pulling blocks until they are in their designated place. Click here to play the game.




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Good Luck

Thanks for inviting me into your classroom. I know you'll get out of this what you put into it. Best of luck on your blogging adventure. I look forward to coming into your "classroom" from time to time.




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Thursday, January 05, 2006

Welcome 8-16 to your Blogging Adventure!

Hello to the students of 8-16. Welcome to your Math Blog.

Good luck and learn lots.

Mr. H




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