Scribepost for May 12

Today in Math class Mr. P wasn't here so Mr. Isfeld is teaching us. There was also an assembly about foot ball so we didn't do much.

But what we did do is study for our test tomorrow.

Here are some things to know to be ready for the test.

d=2r

This means diameter equals radius x 2.

This basically means that the diameter is twice the radius.

C=πd

This is the formula to find out the circumference. The formula stands for Circumference equals Pi times diameter

This means that the diameter times the Pi will give you a circumference.

The Pi is 3.14159265

But for the test, we will use the shortened version-3.14.

C=2πr


This is basically the first two formulas combined. You multiply the radius by 2 and multiply it by π (3.14)

And we also got a study quiz.

This is what it looked like:

Diameter	Check	Radius
10		5

The middle "check" part is for you to check your answers later to see if you got the answers right.

You can also do this in home without the sheet.

I hope every passes the test.

Edit: I keep forgetting, I pick Brayden to do the next scribepost.

Scribe post for May 7 2009

Today in math we did more things about circles.

Today we also got a new seating plan. Instead of our normal rows we were put in groups.

We started out with a warm up question. The question was how can u start from the centre and draw a circle without lifting your hand. While we were working on his we had a homework check for the problem of the week.

The answer to the question was start from the centre and fold the corner then start drawing over it. The once you start turning unfold the corner and finish the circle.

After we finished with the warm up question we checked our problem of the week. The problem of the week question was using the numbers 2/7, 4/7, 6/7, 8/7, 10/7, 12/7, 14/7, 16/7, and 18/7 only once, place them in the circles such that the sum on each side is 34/7.The answer was starting from the top going right: 4/7, 10/, 14/7, 6/7, 8/7, 18/7, 2/7, 16/7, 12/7, 4/7.

Note: This is not the only answer to the problem of the week.

After we finished checking our problem of the week we moved on to a group activity. The activity was everyone in your new seating plan were to measure a bunch of circles and put down their findings on a chart that was with their math notes.

After some time working on this activity we reviewed our answers. After that we had some notes.

We have discovered that the circumference or perimeter of a circle is approximately 3 times its diameter. Therefore we can use 3 x d when estimating circumference

We have also discoverd that the ratio of the circumference to diameter is approxemetly 3.14. We can use this value to calculate circumference. This value is repersented by a constant Pi which is often repessented by the greek symbol ---------------------------->

After we finished the notes we all handed in our homework which was to make a illusion with a circle that was at least 20 cm in diameter.

The next person I choose for the scribe post is Brendan.

Please comment.

Scribe Post for April 20, 2009

This is what we did in Math on April 20, 2009

Problem of the Week:

What is the least positive integer meeting each of the following conditions?

Dividing by 7 gives a remainder of 4.
Dividing by 8 gives a remainder of 5.
Dividing by 9 gives a remainder of 6.

Notes:

Integer Subtraction using chips

In pairs solve the following using (+) and (-) chips.

(+9) - (-8)= -1
(-10)-(-4)= -6
(+5)-(+8)= -3
(-3)-(-7)= -4
0 -(+6)= -6

To subtract integers using chips (+) and(-) chips...

1. Model the first integer in the equation by using chips.
2. Then take away the number of chips indicated by the second integer.
3. "If nothing is there add a zero pair."

Note that adding zero pairs to the first integer does not change its value but does give something to take away if we need to in order to solve the question.

Here is an example:

5-7= (+)(+)(+)(+)(+) then add (+)(+)
(-)(-)
5-7= (-)(-)

5-7= -2

And then we played a game where we had to go up/down the mountain/bottom of the sea then back to sea level.

And we got back our tests from Friday.


And you can also go to this website: http://www.yourteacher.com/geometry/subtractingintegers.php

Scribepost for April 6th 2009

Math Class For April 6th

For April 6th 2009's math class, the substitute teacher took time in explaining with us the basic introduction to "Integers". So for anyone who wasn't there , or who was there but didn't quite get the notes. "Keep On Reading (:"

The word "Integer" literally means untouched or whole in Latin. Integers from the set of "all whole positive and negative numbers and zero".

REMEMBER !

- Positive Integers : Numbers greater than zero
- Negative Integers : Numbers less than zero

Integers are written with a "positive or negative" sign in front of the number. eg. - (+1), (-1), +1, -1

NOTE !
Often positive numbers are written without the (+) .
eg. - +1 can be written as "1"

The sign of a integer indicates its position relative so zero. eg. of a numbers on a "Cartesian Plane"eg. - 2,2 (q1) , -2,2 (q2) , -2,-2 (q3) , 2,-2 (q4)


Opposite Integers

Every integer has a negative counterpart, when these are added together .. they have a sum of zero. The pairing of opposite integers are also known as " zero pair".


eg. - (+1) + (-1) =0

That's The End Of The Note Taking Parts ..
but work wasn't over yet ..

We were all given worksheets about "Integers" with the exceptions of the people who weren't there. If ever you didn't happen to finish it in class, remember that it IS homework.

I CHOOSE PRINCESS MAGNAYE FOR THE NEXT SCRIBEPOST (: !
comments , THANK YOU ! .


watch this ! (:

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

CREDITS TO : math.about.com/od/geometry/ss/cartesian_2.htm

Scribepost for March 23, 2009

The first thing we did today was number of the day, as usual.
The number was 8756.934, in case you weren't there today, or you
didn't write it down.

After number of the day, we did notes.

Bisect - Bi means "two".
Sect means "cut".
So bisect means to cut in two.
Perpendicular Bisector - A line that divides a line segment in half and is at right angles to it.
eg.

How can you create or draw a perpendicular bisector?
1. Free hand O.K. but not perfect.
2. Protractor gets us 90° angle.
Ruler cuts line in half.




3. Use a compass and create arcs.

a) Open compass to greater than half the distance of line.
b) Place compass of pt. (point) A draw an arc.
c) Place compass on pt. B draw an arc.
d) Use a ruler to connect the intersections of the arcs that line is a perpendicular bisector.

Angles -
angle - the figure formed by two lines with a common end point called a vertex.

acute angle - less than 90°

obtuse angle - more than 90°
less than 180°

angle bisector - the line that divides an angle into two equal parts.

How do we make an angle bisector?
1. Free hand not perfect not accurate enough.
2. Protractor.

3. Compass.

a) Arc from vertex,
b) Arc from pt. S (intersection of line and arc)
c) Arc from pt. T (intersection of line and arc)
d) Line from arc intersection to vertex.

After we did those notes, we worked on some Math Links.
Pg. 116 - 121.

Thank you for reading my scribe, and please comment after, if I made any mistakes, or errors.
I choose JORDAN for the next scribe.


P.S : Sorry my scribe was a little late, my computer kept shutting down.

ScribePost for March 17, 2009

Today in math we did number of the day which was 1936.295. Number of the day is always homework! We had homework and notes:

Area= Area is the number of square units in a two dimensional region.

eg: 4 cm squared
4- amount cm- units

Area of rectangle or square

Length x width = area

a=L x W
a=6 x 2
a= 12 m squared

eg:

Parallelogram= a four sided figure with opposite sides parallel and equal in legth.

I means sides are equal in length
II
^ means lines are parallel

base= a side of a two dimensional closed figure
=common symbol is b.

height= the perpendicular distance from the base to the opposite side.
=common symbol is h.
eg:


Perpendicular= a line that meets another line at a right or 90 degree angle.

a= L x W a= b x h
a= 6 x 2 a= 6 x 3

a= 12 m squared a= 12 m squared

EEach height is the exact same size.

Area of Parallelogram

a= b x h

h= 3 cm a= b xh

b= 9 cm a= 9 x 3
a= 27 cm squared

Find the area of the following figures.

A:

Please comment me and tell me if I did any mistakes!!!

scribepost for March14,2009

The number for number of the day was 2468.135

AFTER NUMBER OF THE DAY, WE WROTE DOWN SOME MORE PROBABILITY NOTES:

RANDOM: an event in which every outcome has an equal chance of occuring.
EXPERIMENTAL PROBABILITY: the probability of an event occuring baced on experimental results.
THEORETICAL PROBABILITY: the expected probability of an event occuring.

EG. Flipping a coin.

THEORETICAL PROBABILITY:
5 HEADS 5 TAILS

EXPERIMENTAL PROBABILITY: [ we flipped a coin 10 times ]
HEADS: 4 TAILS: 6

*The larger or more trials in an experiment, the closer experimental probability gets to theoretical probability.

AFTER WE WROTE DOWN THOSE NOTES, WE WENT INTO PG. 180 (1-11) IN MATH LINKS.

I choose Joshua for the next scribepost.