Representing percents

Today in math class we had three goals but we only got 2 done.

1. Start Chapter 4 Representing Precents.

We learned how to represent percents more than 100%.

We also learned how to represent percents less than 1 ex. 1/2%

2. We corrected the math test! The class average was 75%. Which I think is pretty good.

People had the most trouble with number 22, 23, 24, and 25

Question

Hey O was up um i have a question :(

How do you find if it's a right triangle

My Foggiest Moment

The thing I was having trouble with was finding the whole number in between a certain square root. I now understand it though. Ex. finding the whole number in between the square roots of 8 and 9. The numbers would be 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, and 80.

Test Friday!!

Troubles

the thing i was have trouble with was questions like, find the whole numbers with a square root between, lets say, 5 and 6.. i just was reading the question wrong.. but i get it now it would be 26,27,28,29,30,31,32,33,34,35

Need help

I don't understand our to use prime factorization to get the square root

Thing I have trouble with

I don't understand how you get a square root using prime factorization.

My Foggiest Moment

My foggiest moment was number 11 on page 105. I understand it now. The thing I didn't understand was that I didn't know if I added my first square rooting into the equation or if I just left it out. But I just did it off to the side. Then I did my work slowly and carefully and I think I got it right!

Finding The Hypotenuse and the Leg of a Triangle

Todays Math was crazy! Mr.Oldcorn ripped out everyones homework and recycled it because it was wrong! We did the questions all over again! The reason why people aren't getting things is because they think 12 squared is 12X2, well it's not. 12 squared is 12X12. After Mr.O explained, the class was starting to understand. There are three ways to find the leg of the triangle. I'll show the way I like it. Oh ya 2=squared
A2 + B2 = C2
72 + B2 = 252
49 + B2 = 625
-49 - 49
72 = 576
B = 24cm
Remember to do your homework. Do to end of page 110 #10.

Things I have the most trouble with

OK the things I am having the most trouble with in math is with the Pythagorean relationship like finding hypotenuse , and a bit with square roots :)

The thig I have the ost trouble with is the Pythegorean relation

things i have problems with....

the thing i have the most problems with is the Pythagorean relation

Need Some More Attention Too...

The blurriest thing to me is different situations where you would use the Pythagorean Theory and when you would measure with your ruler.

Hardest topic in math for me

I think the Pythagorean relationship has been the hardest so far in this unit. Ex. Find the length or area of the hypotenuse.

Warning! Estimating Square Roots Zone

• First of all, we read through page 95-97
• On page 95 we looked at the picture that looked a little like this:

To figure it out you must find the square roots of 36m² and 49². The square root of 36m² is 6 and the square root of 49m² is 7. The square root of the middle mat has to be somewhere in between 6 & 7.

• On page 96 we looked at example #1. Felicity wants to build a pool. The area is 7 m². So to figure it out you must find the higher and lower square roots. (2²= 4 and 3²= 9) and 7 is closer to 9 so it would be closer to 3 than 2.



• We then, after lots of discussion, did show you know on the botttom of page 96 after looking at the solution to example #1.



• If your having trouble; look here:

What's the square root of 23?

1. make a number line



2. find the higher square root and/or perfect square and the lower square root and/or perfect square



3. find halfway ( if you need to write all numbers between the perfect square and cross off 1 by 1)



4. and then make an reasonable estimate

• Then we looked at example #2 on page 97


• We discussed example #2 (Which was finding all possible numbers with a square root between 2 square roots)

HOMEWORK:

• Yesterday's homework SHOULD be done
• Page 1 on the Handout we got today!

DUE TOMORROW!!

Math Class Thursday!

Today in math class Mr. Oldcorn told us that he will start marking our posts next week. They will be out of 10 marks. MAKE SURE YOU HAVE ALL YOUR CORECTIONS DONE!



First thing we did was pracitice some quick race guestions as a class to refresh our memories.
Example:
Then We were told to find the perfect square.
Example:





Then we did work on page 99 numbers 4-9 and 14 well some of the othe sutudents worked with Mr. Oldcorn on the smart board. Remember page 99 is due monday.

The next scribe will be Brittany McIntosh congrads!

Review of 3.1, 3.2 and 3.3

If A=15 cm2, B=5 cm2, then C would have to be 20 cm2. You see, in order for the triangle to be a right triangle the legs (two sides which are not the hypotenuse... the hypotenuse is the side opposite the right angle) area in A and B must equal the area of C. The Pythagorean Relationship states that A2 + B2 = C2.


The Pythagorean Relationship can also be used in real life, it has to be used for the highways and on buildings. "The construction workers wouldn't go out to the highway with a little protractor to measure a ninety degree angle." Those words were straight from the lips of Mr. Oldcorn.


Many people got 13.C) wrong on the page we were correcting, it was...'If B is 25 cm2 and C is 90 cm2, What is A?' The thing people did wrong was that they added 25 and 90, HOWEVER, it said what is A! A isn't the hypotenuse therefore, you don't add you, subtract so... C-B=A = 90-25=65 cm2 So A was 65 cm2!


Another thing we went over is square root, for example, you know the square root of 36 is 6. But how do you figure it out? Well, there is three ways to do so 1. Prime Factorization 2. Guess and Check 3. Calculator But what if you had a number that doesn't have a whole number for the square root. Like 51. Question, How would you find the square root of 51 without a calculator. Well you couldn't easily do it with prime factorization. So you can guess and check. But to do so first you have to find the closest two numbers. 51 would be 7x7=49 and 8x8=64. Once you know that you need to figure out whats halfway between. Half between 49 and 64 is 56.5 and 51 is closer to 49 than 64 so it's closer to 7 too. Which would mean it'd be around 7.2 .


After that we had a class vote, we could either have a quiz on 3.1, 3.2 and 3.3 or wait until the end of the unit and have a big test. It turned out more people would rather have a halfway test then a big test. We assigned the quiz for Monday, however, the date might change. You should probably start hitting the books for Monday!

This is a diagram of a right triangle to show you which are the legs and the hypotenuse.

Corrections!

Today our class had two math classes. In the first class we passed our homework to the person beside us and corrected it. For Homework we had to do page 85 #5 to 12. Some of the students didn't know or forgot how to discover the square root. Mr.Oldcorn then showed the class three different ways to find a square root of a number, which would then find the perfect square.
Here is what he suggested for the class.

1. guess and check,

2.Use a calculator,


3.Prime factorization,


Thats most what we did, But I'll post more tomorrow!
Don't forget your homework for tomorrow, Page86 #13,15,17,19 and 21!

Quick Races and Factor Trees

Today in math we didn't do a whole lot as we only had the one period.

• The first thing we did was look at Leonard's post on the blog. He wrote about the Get Ready page and about how you have to read the questions carefully.

• The next thing we did was do a couple quick races. More people got the answers quicker than they did yesterday. Here is an example of one of the quick races we did today.

128-462 The first thing you would do is subtract 128 from 462. That leaves you with 334. You then divide 334 by 2. Once you do that you get 167. You then add 167 and 128 together to get a total of 295 which would be the number inbetween 128 and 462. I think we did two quick races.

• The next thing we did was go over the definitions for factors, product, prime factorization, and prime numbers.

The definition of:

• Factors: Factors are the numbers you multiply to get the product. Ex. The factors of 10 would be- 1, 2, 5, and 10. You would probably use a factor tree to find the factors of a number.

• Product: The product is the number you end up with after multiplying two numbers. Ex. 2x5+10. 10 would be the product.

• Prime Numbers: Prime numbers are numbers that have only two factors, one and itself. Ex. 7. The factors of 7 are 1, and 7.

• Prime Factorization- Prime factorization is a number writtn as the product of its prime factors. Ex. The prime factorization of 6 would be 2x3.

• After talking about that we did some factor trees. Some of the numbers we used were 100, 256, 45, and 27.

• The last thing we talked about was finding a perfect square. Here is the definition of a perfect square.
• Perfect Square- A perfect square is a number that is the product of the same two factors. A perfect square has only an even number of prime numbers. Ex. to figure out if a number could be a perfect square you would use a factor tree. If the bottom numbers had an even amount of each number it is a perfect square.

At the end of class we were assigned page 85 numbers 5-12.

By the way...everybody should finish voting on the poll for the ELA blog. You only have 4 hours left!!

Math Math Math What We Did Today

Today in Math class we:

• CORRECTED our get ready sheet I did pretty good 12 out of 13. Remember for 3. B) it says what is the area of the polygon? Then there is a rectangle with 11 m and 3 m. Read the question and don't put 33 cm2 it should be 33 m2 that got a few people ( area is just length x width)
• We also reviewed prime numbers not Optimus Prime from Transformers. Prime numbers are numbers that only have factors of one and itself. For an example I got, well these are just the numbers I can pull out of my head quickly OK here it goes 2, 3, 5, 11, 7 numbers like that there are also bigger ones to like 3571, 1429, 941, 41
• Factor Trees were what I thought were the hardest for some reason even though I got it right. Uummm lets see I cant really write a factor tree on the computer so I'll just add a picture. (waiting waiting waiting) OK its at the top left and for that factor tree if I had 18 but then I put 2 and 9 below it if I do every thing correctly it should end up as 2,3,3 and I think it can go backwards too. I cant remember little help Mr. O?
• Oh ya I got to do something for that Numbers Between number five. Say you have 49 and 87 and you want to find the number exactly in between. OK you take the 87 then minus 49 that equals 38 then you divide the difference by 2 (the difference is 38) then that will equal 19 then you add the 19 to the 49 that equals 68 and now that is the exact number between 87 and 49. Its 68 isn't that easy? If you have a number like 4 and 9 that will come out to be a decimal 6.5 that's the answer.

• Lets see what else do I got to explain? Oh yes equations that contain a variable like 4x + 1 = 13 im gonna tell you how I do questions like this. Here's my secret do the question backwards like so 13 - 1 /4 = x then it would be 12 / 4 = 3 so x=3 you can also break it into parts too but that's just the way I do it.

In an unrelated note give your parents the parent teacher forms. I hope everyone looks good in there pictures because you don't want to look like a potato some farmers think a potato is a beautiful thing but no not now you don't want to look like a potato.

Another Chapter

Hey its Tanner

• at the start of math class we finished our writing out our definitions for chapter 3 in our math notes scribbler
• after that Mr. O showed us another math blog in grade 8 about the same pace that we are going and wow they sure know what they are doing. So Mr. O emailed the teacher and asked if they could maybe help our blog. We are still waiting on the reply
• Mr. O then said that our scribes post need to get better and better each time
• The poll to see if we want an ELA blog has only 2 days left everybody vote
• Mr. O then handed out 2 math sheets one Problem of the Week (due Friday) and the other Getting Started ( a sheet to get ready for the chapter)
• For the Problem of the Week you only have to do 1 of 6 questions this week. The problems are real life problems and they will make you think. " don't just chose the easiest ones, challenge your self" quote by Mr. O

Well that is pretty much the gist of what we did in math today

David after the Dentist/definitions.

hello, Its Devan

At the start of math class we watched "David after the dentist".

• We talked about digital footprints.
• We had a discussion about the internet safety, just remember-google never forgets.
• Internet safety is a big deal. An example of this would be not to put your birthday, full name, phone numbers or anything like that.
• Be careful what you put on the internet.
• Ask yourself this question," If everybody I know saw this would it be okay?" That inculdes your parents, grandparents, friends etc. If you hessitate to answer this don't do it, cause it could come back to haunt you.
• Math-Chapter 3- Pythagorean Relationship
• Definitons
• Prime Factorization- a number written as the product of its prime factor, the prime factorization of 6 is 2x3
• Perfect square-a number that is the product of the same two factors, has only an even number of prime factors, 5x5=25, so 25 is a perfect square
• Square root- a number that when multiplied by itself equals a given value, 6 is the square root of 36 because 6x6 = 36
• Hypotenuse- the longest side of a right triangle, the side opposite the right angle
• Pythagorean Relationship- the relationship between the lengths of the sides of a right triangle. The sum of the areas of the squares attached to the legs of a right triangle equals the area of the square attached to the hypotenuse.

The Aftermath (test) ..

Today we went over how hard the test was.

The results were mixed.

Then Mr.O told the class to correct the tests with our handy dandy text book.

The class average was around 62% so we did really bad. Some people were suprised with their marks, so we discusted how we could do better.

Some things were:

1) Read over the questions more carefully.
2) Check over your work.
3) Expand your time in studying so you know more.