Todays Math Class

In todays math class we found the are of G C I F

C, D, I, E = 25m

I, F, E = 12.5m squared

A, H, B = 40m squared

B, C, H, G = 70m squared

C, G, F, I, = 52.5m squared

The area of the Rectangle is 200m squared

Percent

30% means 30 out of 100

Percent is a fraction out of 100 or a denominator of 100

____

100

eg. 30% = 30 = 0.30

___

100

We can use money skills to think of fraction decimal percent

something something something

_______ ________ ________

something 1 100

25 50 10

____ ____ ___

100 100 100

(25%) (50%) (10%)

Find 50 % of $84.60 = $42.30

Find 25% of $84.60 = $21.23

Find 10% of $92.30 = $ 9.23

Find 50% of $45.80 = $22.90

Find 25% of $ 50.00 = $ 12.50

Find 10% of $72.40 = $7.24

Using a ratio table find 37.5% of 120

HOMEWORK

Using the ratio table find:

75% of 16

60% of 90

40% of 80

The Half and Differences between Numbers

The whole numbers that are between 7 and 13 are 8, 9, 10, 11 and 12.
The difference between 13 and 7 is 6.
13 - 7 = 6
Half of this difference is 3.
6 divided by 2 equals 3.
The number 10 is halfway between 7 and 13.
Like this:
7 + 3 = 10 Or...
13 - 3 = 10

Finding a halfway between numbers.

You can add the given numbers and divide it by two.
Like this..
70 and 170
70 + 170 = 240
And divide it by two. It equals 120.

And:

If you don't get it still, look at these examples we did during class...

1. What are the whole numbers between these given numbers?
68 and 72: The answer would be 69, 70, 71.
108.3 and 111.6: The answer would be 109 and 110

How? If you think of it as the alphabet, like, A B C, you know that
B is in between A and C.

I hope this website helps:
http://pcimt.blogspot.com/2008/01/halfway-numbers.html

Area

Area(a)- the number of square units contained in a two dimensional shape and also is the surface space a shape takes up..
Example:


Area of square and rectangle>>> Length x Width = Area



Parallelogram- a four figure with opposite sides, parallel and equal

Example:Height(h)- the perpendicular distance from the base to the opposite side.

Example:
Base(b)- side of a two dimensional closed figure.(SHAPE)

Example:
AREA OF PARALLELOGRAM
A=B X H


(b) is 5 cm and (h) is 3cm. Plug there values into a formula...
A = B X H

A= 5 x 3

A= 15cm


http://www.youtube.com/watch?v=KVFwRA7kcLY

ANGLES

ANGLES

- Space Between Two Connection Lines

eg.

CUTE ANGLE

- An Angle That Is Less Than 90 dg.

eg.

Obtuse Angle

- An Angle that is greater than 90 dg. and less than 180 dg.

eg.

Right Angles

-Exactly 90 dg.

eg.

Straight Angle

- Exactly 180 dg.

eg.

ANGLE BISECTOR

- The Line That Divide And Angle In Two Equal Parts

- Equal Angles Are Marked With The Same Symbol dg.

eg.

HOW TO MAKE A ANGLE BISECTOR

1. Fold Paper

eg.

Method 2. Use Compass Make An Are From The Vertex That Crosses Both Arms.

LABEL THEM X,Y

2. Make An Are From Point X and Y They Must Be Equal Size.

3. Draw A Line From Point B To The Are Intersection.

eg.

Method 3. Use A Protractor

1. Measure The Angle DEF 140 dg.

2. Divide Your Angle Measurement By 2

140 dg. Divided By 2 = 70 dg.

3. Make A Mark At 70 dg. Using Protractor Labeled Q

Y. Join Point Q With The Vertex With A Straight Line

eg.

Bisecting Perpendicular Lines

Bisect-

Bi means two.

Sect means cut.

So if you put it together, bisect means to cut in two.

Perpendicular Bisector-

A perpendicular bisector is a line that divides another line segment in half and is at right angles or 90 degrees.

Remember that equal line segments are marked with "hash" marks.

Ways to Make a Perpendicular Bisector:

- Use a right triangle.

- Use a ruler.

- Use a compass

1. Make an arc from point A that is greater than half way.

2. Make an equal sized arc from point B.

3. Connect the arc intersections with a straight line. That line is a perpendicular bisector.

Here is a video for all of you to enjoy and hopefully it will help you understand bisecting more.

** Today's Homework**

Draw a 12 centimeter line segment and label it PQ. Draw the perpendicular bisector of this segment using all three ways. Label the point where they intersect R.

Remember that there is going to be a test tomorrow on perpendicular, parallel and bisecting line segments. So everyone please study hard.(:

Please comment on my blog and please point out any mistakes I made.

How to Draw Parallel and Perpendicular Lines

How to Draw Parallel Lines

1. fold and label paper like so:
   
   
   


2. use a ruler and set square like so:
   

How to Draw Perpendicular Lines

1. fold paper like so:

2. use protractor like so:

Remember...
Pages 86-88 #1-16 is HOMEWORK!!!
Here is a quick link to save you the trouble of typing.

If you still have trouble with perpendicular lines, here's a video.

Parallel and Perpendicular lines

Parallel and Perpendicular lines



Geometry- shapes and measurements.




Parallel- describes two lines in the same plane that never cross, or intersect.


- they are marked using arrows.

Perpendicular- describes lines that intersect at right angles. ( 90°)



- they are marked using a small square. ________________________________________________________________

measure the diference from:

A to B

B to C

E to F

F to G

I to J

J to K

they all are 8.9 cm.

_________________________

identify any parallel lines you can find.

AE // BF, EI // FJ, CG // BF, GK // JF, AI // CK

what d0 you notice about parallel lines? they always are the same distance apart no metter where you measure, as long as you measure a perpedicular line.

identify any perpendicular line segments.

AE __ DF , FE __ AI , BF __ EG , CG __ FH

What do you notice about perpendicular line segments? they all meet at 60° angles.

*****************************************************************************

here is a link to a video i watched about line parallel and perpendicular lines.

http://www.youtube.com/watch?v=Rew54K6mYUo

__________________________________________________________________

*HOMEWORK*

#1. Are line segments AC and DF parallel?

#2. Are line segments DF and BE perpendicular?

#3. Are line segments AC and BE perpendicular? How do you know?

#4. Would a line segment joining A to D be parallel to a line segment BE? How do you know?

Test

Due to the Remembrance day service we will only have a test on Thursday. Be sure to study each night this week.

Term Test

A reminder that we have a quiz on Tuesday, covering adding, subtracting, multiplying, and dividing decimals. Order of operations will be covered on the test as well.

Lastly, we have a Term Test on Thursday it will cover the entire term's worth of work. Be sure to start studying now, do not wait until the last minute!

Test Answers and Homework.

Today's Test.

Number of the test is : 8497.365


1. Half of the number of the test is: 4248.6825

2. Write the number of the test in expanded form: 8000 + 400 + 90 + 7 + 0.3 + 0.06 + 0.005

3. Write the number of the test in written form: Eight thousand, four hundred ninety-seven and three hundred, sixty-five thousandths.

4. Round the number to the nearest 100: 8500

5. What Digit is in the tenths place: 3

6. The number of the test doubled is: 16994.73

7. 123.45 more than the number is: 8620.815

8. 987.65 less than the number is: 7509.715

9. (You do not have to answer this)

10. Cube, the digit in the ones place: 7 x 7 x 7 = 49 x 7 = 343 (No, not 7x3.)

11. Square, the digit in the hundreds place: 4 x 4 = 16

12. Divide the number by 3.55 and round to the nearest hundreths: 2393.62

13. The product of all digits in the number of the test is: 181440


*Please comment and tell me what I did wrong if there are mistakes. I will edit it to make sure it's right.


Todays Homework:

Pg. 71-73 #4-24 .. First do even, after do odd numbers. (ex: first do answers 4, 6, 8, etc. then do 5, 7, 9, etc.)



Reminders:

Also, PLEASE study for the test next week. Sorry to tell you guys but .. WE 7-43 HAVE 2 tests next week, one on Tuesday and one on Thursday.

Number Of The Day

Today's number of the day is: 2691.348

1. Half of the number of the day is: 1345.674

2. Write the number of the day in expanded form: 2000 + 600 + 90 + 1 + 0.3 + 0.04 + 0.008

3. Write the number of the day in written form: Two thousand, six hundred, ninety one and three hundred, forty-eight thousandths.

4. Round the number of the day to the nearest 100: 2700

5. What is the digit in the tenths place: 3

6. The number of the day doubled is: 5382.696

7. 123.45 more than the number is: 2814.798

8. 987.65 less than the number is: 1703.698

(You don't need to do number 9)

10. Cube the digit in the ones place: 1 x 1 x 1 = 1

11. Square the digit in the hundreds place: 6 x 6 = 36

12. Divide the number by 3.55 and round to the nearest hundredth: 758.13

13. Product of all the digits in the number of the day is: 2 x 6 x 9 x 1 x 3 x 4 x 8 = 10368

* If I did any wrong, please tell me what I did wrong and how to do it properly (:

*Pages 71 - 73, # 4 - 24 ( Even numbers only) in textbook work was assigned to us although it is not homework. Next class we will continue where you guys left off.

*For people who didn't make up a math equation that equals to 6 for letter G (yesterday's homework).. make sure that you do one to get marks!

*Tomorrow's test will be on number of the day! So make sure you know how to do them properly. If you have any questions just comment.

What is BEDMAS?

Today at math we were learning BEDMAS.

1st B- ( brackets )
2nd E- exponents 32, 43
3rd D- division
----M-multiplication
4th A- addition
----S- subtraction

BEDMAS describes as the order of operations or the order of which you operate an equation.

To practice our knowledge, we were given equations to solve:

A. 2+3x4=
2+12=

14

B. 10-6÷2=
10-3=
7

C.(2+3)x4=

5x4=

20

D.(10=6)÷2=

4÷2=

2

E. 8÷22=

8÷4=

2

F. 4x3÷2+5=

12÷2+5=

6+5=

11

G. Create an equation that includes +, -, x, ÷, exponents, and brackets. The answer will equal 6. You can't repeat any number more than once and you can't use zero. Explain why you think my equation is right or wrong. If wrong, give an equation that is right and tell me what I did wrong.

This is the equation I got to get my answer:

(8x4)÷23+(9-7)=

32÷23+(9-7)=

32÷23+2=

32÷8+2=

4+2=

6

What we learnd today

Today we did number of the day and we work on something called order of operation. We a word called BED MAS. B is for brackets, E is for exponents, D is for division, M is for multiplication, A is for addition and S is for subtraction. Addition and Subtractions are brothers.multiplication and division are sisters.1 brackets are (3+1) 2 Exponents are 52 3 divide or multiply in order from left to right 4 addition or subtraction in order from left to right.
(1.75-0.5) times (4.2\0.6+7.3-1.2
0.70 times ( 4.2 \ 0.6) + 7.3 -1.2
0.70 times 7 + 7.3 - 1.2
4.9+7.3-1.2
4.9+6.1 =11

What sign goes were
5.2\4+2.1
1.3+2.1
3.4 =3.4

2 times 3 \ 6 + (2-1)
2 times 3 \ 6 + 1
6 \ 6 + 1
1+1 = 2

Annie has been asked to calculate 1.7 + 6 \2. she claims the answer is 3.85. do you agree or disagree? Explain why or why not. I think it is wrong because I 1.7 + 6 \ 2 then 1.7 + 3=4.7 so I think it is wrong.


www.coolmath.com/prealgebra/05-order-of-opera... (its a pic)
the best song ever :D http://www.youtube.com/watch?v=M11SvDtPBhA

Why We Estimate

Why we estimate: The reasons why we estimate are

To get closer to an answer

To make a problem easier

And to know what to expect from a calculation

You have 1.36L of OJ and theres 4 people that you need to share it to. How much OJ does each person get?

One way to do it is you round the 1.36L to 1L. Then if you divide it by 4 it equals 0.25. Then if you get the .36 and divide it by 4 you get 0.9 and if you add that with the 0.25 you get 0.34L. So everyone will get 0.34L of OJ.

Picture of a number line

http://www.youtube.com/watch?v=pXhW5RaGKVA

Dividing Decimals

Division: Division means that in the statement 5/2=3. There are three groups of 2 in the number six.

(:(: (:(: (:(: - 3 groups of 2 smiley faces.

The word Quotient is the answer to the division question.

If you have 6 dollars and you need pens for scrap booking that are 0.40 cents each?

We used 10x10 grids to solve this problem.

I did my grid like this :

(every colour represents a new type of pen.)
The number you could get with $6 is 15 glitter pens.

If you look at the two first pictures


= 5 glitter pens. and this is equal too $2 , 2 goes into 6 3 times. So, multiply the 5 x 3 = 15 glitter pens.

Now if you estimate, and make it an EASIER question, this is how you do it.
.40 round it off to 0.50 and round it to 2.



2
+2 - 2
__
4 -4
+2
__
6 - 6
+2
__
8 - 8
+2
__
10 - 10
+2
__
12 - 12

Where to put the decimal?

4/3.6=42778.

Round 3.6 to 4.
Now, change the question to a multiplication question.

4x4=16.
Now divide the 16 by 4.
16/4=4.
4 is nearer than 42. So put the decimal between the 4 and the 2.

4/3.6=4.2778.

This is a lady showing you how to divide decimals, if you need any help.

Multiplying Decimals

This is a blog of today's math notes.

How do you multiply by decimals? First we will look at dividing by .5

Multiplying by decimals is the same thing as dividing by whole numbers. But how is that possible?

If you multiply something by less than 1 you're going to get a smaller number than the number you are dividing by. 2x.5= 1. Its the same as 2 divided by 2.

eg. 46x2.5

Let's break it down.

40x2=80 6x2=12

80+12=92

Now we have the decimal part.

When you see x.5 it means to divide by 2

So 40 multiplied by .5 really means 40 divided by 2

40 divided by 2 equals 20

6 divided by two equals 3

20+3=23

92+23=115

So 46x2.5= 115

Here's a video that might help.

One thing the video brought up is that even though it looks like the answer is 3,864 you have to consider the numbers after the decimal point that hold value. In the equation the digits .1 and .4 are after the decimal point so you move the decimal point two places to the left. You will get 38.64 instead of 3,864.

I'm sorry about the fact that my keyboard doesnt have a divide button on it.

Remember: Math Links page 57-59 numbers 3-21 isn't homework

Here's an excellent link to a website that explains the concept of multiplying decimals well.

http://www.mathsisfun.com/multiplying-decimals.html

Estimating Decimals with Multiplication

This is a blog of today's notes and homework.

What is the total when estimating?

1.69 x5= Tax is included.

Younger sister says it only costs 5 bucks.
Older brother says it only costs 10 bucks.

What are they thinking, how are they estimating?

Younger sister is thinking Under estimating, just 1.00x5= $5.00

Older brother is thinking Over estimating, 2.00x5= $10.00

Where do the decimals go?
2.2 x 1.8= 3960

Where do the decimals go here?

3.9 x 5.8= 22620
Is $9.00 enough and prove it.


2.57 x 0.45= 118220


Pronghorn: 58kg Dall's: 1.5 times as much as a pronghorn.
How much does Dall's weigh?
Approximate: 90kg. 60x1=60 kg.
90 kg. (In between the two weights.)
60x2=120 kg.
Exactly: 87kg.


Homework is:

46x2.5 = 64x4.5 = First estimate then calculate.


Here is a video for multiplying decimals. If you click multiplying decimals it will take you to a link that explains the multiplying of decimals. Good Luck and I hope it isn't hard to understand.






Mr.Isfeld will be collecting number of the day tomorrow.

How To Scribe

This is a demonstration on how to scribe.

Link- highlight a word and press the green button. Then look for a site that you think would build interest and that is about the topic. Then you copy and paste the URL. After you get a link, click preview to check the link. Check out this link!

Image- find an image (google image) then save it to your computer. Then browse and find the image. You can change the layout and size. Then press upload image. See this image!











Video-Go to youtube and find a video that will build interest about the topic you are discussing. Once you've found a video, click on the grey box anf highlight and copy the code that is in the box titled "embed". Then click edit HT.ML. Scroll to the bottom then pick the code and press preview. See this video!:



Font-To change the font, click the arrow next to the word "font." Scroll down and find a don't that you like and that all can read.

Colour-To change the color, click on the T with the colored squares. Then choose a color. It is best to change the color of important facts, but try not to use bright colors that are hard to see.

Size- To change the size, click the sign with the double T's. Then change the size you want to write with. Don't pick anything too small or too large.

Room 43 first scribe

Here is our first blog.

Check out the link to the greatest team of all time.

Look at this image.

Or this video

Suzie will compose our first scribe on how to create a scribe.

Everyone else will leave a comment. You must leave something nice and something helpful.

Good luck and have a good weekend.