Thursday, October 18, 2007
Gr. 9 Math
Today in class we went over our Review worksheets on integers before our end of the unit test which is today. I will be posting up the answers for the worksheet for those who did not get the answers, or want to check over to see if they did they're work correct.


Before i post the answers, you should remember:
Rules for Multipying & Dividing:
( - ) x ( + )= ( - )
( - ) x ( - )= ( + )
( + ) x ( - )= ( - )
( + ) x ( + )= ( + )
The Order for PEDMAS:
PARENTHESIS
EXPONENTS
DECIMALS & MULTIPLYING
ADDING & SUBTRACTING
which ever comes first, you do.
Starting for left to right
ex. (9-4) + 4 x 6
(9-4) + 4 x 6
5 + 4 x 6
5 + 24
= 29

A number line if you need help on knowing the smaller numbers and larger numbers.








Answers to Review Worksheet on Integers:


1. Highlight the numbers that represent integers
1/2, .3333 , (-4 ), 32, +1/4, 50%, +18


2. State the opposite

-7 +7 -2 +2 +8 -8 -3 +3 +22 -22

3. Complete the chart


(if you do not understand, check the number line at the beginning to help you )




4. Circle the larger integer in each pair.









5. State the Integer described by each of the following:
a) 22°C above zero : +22
b) 9°C below zero: -9
c) 234m below sea level: -234
d) A loss of 13 points: -13
e) A profit of $1216: +1216
f) 8 floors up: +8
g) 12 under par: -12

6. explain and show how you got the answer for +4 + (-3)


- State with 4 positives and 3 negatives
- ■ + ■ = 0 [ cancel zero models]
- Positive 1 is left over
- +4 + (-3) = +1



7. Write out the steps to solve (-16) - (-4)
Step 1: Change subtracting sign to adding
Step 2: Change -4 into +4
Step 3: Add -16 + (-4)
Step 4: take the signs from the larger digits. In this case its (-)
Step 5: Subtract -16 - 4 = -12
The answer for -16 - 4 = -12

8. Complete the table.















9. Use PEDMAS to solve the following:









Ms. Nicholson taught us a new clever trick.
Pick any number: (ex. 2)
Double it: ( 2x2 = 4)
add ten : (2+10 = 12)
subtract your original number: (12 - 2 = 10)
add fourteen: (10 + 14 = 24)
and divide by 6: (24/6=4)

your and answer should alway be four whether you picked a different number, it doesn't matter, it'll always be four.

That was all we did in class today. *REMEMBER, TEST TODAY. Sorry for posting this really late. If there's any questions, or you see i made an error, please inform me, or comment your questions. I'm going to bed now, bye (:
The next blogger will be michael (: good luck.




Labels: , ,

 
posted by aLisa at 6:28 p.m. | Permalink | 3 comments
Thursday, October 11, 2007
In class we took notes:

Order of Operations:

-Anthmetic operations(x, ,-,+) must be solved in a particular order. We can use the acronym "PEDMAS" to help remeber the order. Brackets/Parenthesis hold an operation together and bracket holed a number.
Rules:-Evalute expressions within parenthesis first (brackets) P ( )
-Evaluate expressions with exponents next
-Multiply and Divide from left to right in orded of what comes first M/D
-Add and Subtract from left to right in order of what comes first A/D



Here are some examples of what you have to do.
3 2
Ex. 2+8x22 +3
8+8x4+3
8+32+3
40+3=
43

Labels: , ,

 
posted by Anonymous at 12:42 p.m. | Permalink | 2 comments
Tuesday, October 09, 2007
Grade 9 Math : Daily Blog

Sorry if this isn't the best blog because it's the first one of this year and it's the FIRST one I'VE ever done too.

Well, I think I should start talking about what happened today in class because that's what I'm supposed to be talking about but I don't seem to be doing that.

Okay, well, here it goes! =)

Well, today in class, we talked about who would be the first people to do the blog and what to do.
After that, we corrected the two worksheets we got the week before. One was on multiplying integers and the other was on dividing integers.
While we were correcting, Ms. Armstrong did a few sample questions. She gave a brief mesage about number patterns. It wasn't really something we should put in our binders or take notes about it but I think we might be talking about number patterns later on in the year.
Anywho, she explained the difference between brackets and parenthesis. Here are the notes about brackets and parenthesis :

* Brackets hold an integer together
example : (9)(-3) which means 9 x -3 ( nine times negative three )
* Parenthesis hold an operation inside
example : (9-3) which means 9 - 3 ( nine minus three )
* If there is no space in between variables/numbers, it means multiplication
example : (9x)(-3) ( nine times "x" times negative 3 )

We will be working more on brackets later on in the year. ( Hint Hint ) These notes down here about multiplying negative and positive integers :

* If you have an even number of negative integers, the answer will have a positive sign

example : (-5) (-3) (-7) (+1) (-3) = even number of negatives

ANSWER : +315

* If you have an odd number of negative integers, the answer will have a negative sign

example : (-5) (+3) (-7) (+1) (-3) = odd number of negatives

ANSWER : -315

That's basically all we talked about in class today. Hope that that was informative enough.
The next person who will be doing the Daily Blog for tomorrow will be Paris.

Labels: , , , ,

 
posted by rowenaamparo at 5:08 p.m. | Permalink | 6 comments