Raquel's Scribepost for December 9th

Today in math class, we learned about Similar Triangles.
We learned terms like congruent. Congruent has a symbol that looks like:

Congruent means, Identical in shape and size.

We also learned the term similar. Similar also has a sign which looks like:
Triangles are similar if:

• Two pairs of corresponding angles are congruent
• Three pairs of corresponding sides are proportional
  

- Each vertex is a upper case letter and the opposite is a lower case letter.






A formula that you can use is:

OR


Example:














That`s pretty much it for what we did in math class. Tell me if I forgot anything and please leave a comment if you actually go on here and read it and if you can`t see the picture just click on it.
- Raquel. :)

BTW......
HOOOOOMEWORK
-go to www.spmathgr9.blogspot.com
-read similar and congruent triangles
-apply and practise. Odd or even.

NOOOOOW, I`m done and sorry I know i posted it up late. :S

John's Scribepost for December 5th,2010

Sup guys today in class we talked about scale and scale factors.
The first thing we did was this:

Scale : Proportional Reasoning

Image : Actual

Then we did a problem is was:

A B Aprime Bprime
1 : 7 X : 23.5

But before starting with the question Mr.Backe
explained something about where the primes should go and where they shouldn't go.

Works: A/Aprime = B/Bprime

Doesn't Work: A/Aprime = Bprime/A

Then we started on the question

1 : 7 x : 23.5

1/x = 7/23.5 so you would cross multiply the numbers so 7 multiply x equals 7x
so you would put it like this.

7x/7 = 23.5/7 then 7x/7 would cancel each other out so you would divide 23.5 by 7 and your answer will be 3.36
X=3.36

After we were done talking about that question we did another

2 : 3 11 : x

2/3 = 11/x so as the last question went you would multiply 2 by x which would equal 2x and 3 by 11 which would equal 33. So the format would be like this

2x/2 = 33/2

2x/2 would cancel each other out and you have to divide 33 by 2 to get your answer of 16.5.
X=16.5 Mr.Backe said it was called By Inspection.

After finishing more questions we reviewed the

mm cm dm dam hm km
mi ci di 1000 deca heca kilo
1000000 10000 m 100 10 1
100000 l
g

Then Mr.Backe asked how many 1cm would you need to reach 10km and the answer was you would need 100000 1cm to get the 10km.

Then Class Ended.

Homework:
Read 4.2 139-142
do SYK
CYU 1-3
Practise: odd or even
Apply: 13-16 or 15-19
Extend: 20 and 21 or 21 and 22 (you have to do 21 for sure)

TEST ON WENSDAY ON SCALE AND SCALE FACTOR

If I got anything wrong tell me so I can fix it!!!

JOHN!

Krystal`s Scribe for November 9th 2010.

SUUUP. I got picked to do the scribe today :)

In class, we basically just took notes about "Things You Need To Know". Here are the notes.

Signs,signs,everywhere. Signs....
-In mathematics we follow a certain order to be able to get the same answer. Order is usually devoted by certain symbols that help us get to the same answer all over the world. BEDMAS.
B=brackets= [ ] , { }, ( ).
E=exponents
D=division (multiplication)
M=multiplication (division)
A=addition (subtraction)
S=Subtraction (addition)

Sometimes it`s PEDMAS. P= Paranthesis.

-3.6-2.8-2=
-3.6-(2.8-2.1)=4.3 <---BEDMAS Other Confusing Signs: -When brackets kiss. () ( ), it means to multiply. -A bracket around an integer or any rational number does not necessarily mean, "do me first"
(-3)=6.7=
6x7 6.7. A dot between numbers can also mean multiplication or a decimal, it depends on the dots position.
6.7=multiply 6.7=decimal <--Fail, sorry I didn`t know how to do the thing.

When is a Negative Number, Negative ?


12-(-4/5)=17 4/5
6-[-(-3/-4)]= 6 4/3 = 7 1/3
12(-4/-5)=11 1/5

1=(-1)(-1)(-1)(-1)
-1=(-1)(-1)(-1)(-1)(-1)

All or Some ?
2.3 squared = 36 or 18 ? Answer:18 = 2.(3.3) 9.2=18

(2.3)squared = 6 squared = 6.6= 36
-1/4 + (2/3)= ).43 < decimals or fractions ?

FOR HOMEWORK MAKE SURE YOU FINISH 2.3 AND 2.4 FOR MONDAY !!!!!

next i pick... uhh Faye I guess.

John's Scribe Post For November 4th, 2010

Hey guys

Last class Mr.Backe assigned me question 24 in section 2.1 page 58.

Question: Give an example of a fraction in lowest terms that satisfies the following conditions.

A) Greater then 0, with the denominator greater than the numerator.

Answers: 1/3 or 2/5

B) Between 0 and -1, with the denominator less then the numerator.

Answer: for this answer I had a really hard time with so I looked at the back of the book. 3/-4

C) Less than -2, with the numerator less than the denominator.

Answer: -8/4

D) Between -1.2 and -1.3, with the numerator than the denominator.

Answer: 4/-3.

If anyone can explain question B it would help and if I got anything wrong tell me.

-JOHN!

Raquel's Scribepost for November 4th

QUESTION #17 FOR 2.2

• TWO wooden poles measured 1.35m and 0.83m in length. To make a new pole they were attached by overlapping the ends and trying them together. The length of the overlap was 12cm. What was the total length of the new pole in meters.

- For this question all I really did was add 1.35m and 0.83m and subtracted the results with 12cm.



Yeah, that's mostly it. Sorry, I didn't get enough time to take some pictures.

Karra's Scribe Post for November 4, 2010

2.2 - Text Book
Question: #16

Bella is more comfortable working with integers than with positive and negative decimal numbers. This is her way of understanding -4.3 + 2.5 .

-4.3 is -43/10 or -43 tenths

2.5 is 25/10 or 25 tenths

-43 tenths + 25 tenths is -18 tenths

-18 tenths is -18/10 or -1.8

So, -4.3 + 2.5 = 1.8

A ) Use Bella's method to determine 6.1 + (-3.9).

B) How could you modify Bella's method to determine 1.25 -3.46?

This is how you do the practise 2.2 question 14 in the textbook.

The question:Saida owns 125 shares of an oil company. One day, the value of each share dropped by 31 cents. The next day the value of each share rose by 18 cents. What was the cahnge in the value of Saida's shares?

The solution : Lets say each share is a dollar. now it drops by 31 cents. Its value is now 69 cents. Now we add 18 cents. We have 87 cents. Then we have to figure out what the value change would be now for one share. A share has dropped by 13 cents. Times 13 by 125, or you can do it a simpler way by times by 5 first to get 65 cents . Times by 5 again to get $3.25. Times by 5 one more time to get the final answer $16.25.
The Answer :The total value change of Saida's shares altogether dropped by $16.25.