Robin's Great Book of Integers

Chapter 1
Grade 7 Review


(10)+(-7)=3
have 10 and owe 7
Bracket: These are put in for us for training us for grade 8.

Zero Pairs: This when a positive and negative are put together to make a Zero Pairs

1+(-1)=0

Used in addiction,Times, and dividing

Chapter 2
Sign Rules

Sign Rule (negative signs):
Even = When you have an even number of negative factors, the product is positive.
Odd = When you have an odd number of negative factors, the product is negative.

(2)x(2)=4
(+4)x(+4)=+16
3(5)=15
(3)(3)=6 *Standard form*


(3)x(3)
3 Groups of 3= 9

(3)x(-3)
3 groups of (-3)=-9

(-3)x(-3)
Remove 3 groups of 3

-











(-3)x(=3)
Remove 3 groups(-3)

Same as the other picture.


Chapter 3
Sign Rules

If you have no negative or an even number of negative signs in a division question, the quotient will be a positive.

There are 2 types of division:

Partitive division

Partitive division is making parts.

Example:
3divided by 2= 1


Qualitative division:

Qualitative division is sharing your total, with groups.

Example:
(-3) divided by 2= -1


Chapter 4
ORDER OF OPERATIONS WITH INTEGERS

Brackets
Exponents
Division
Mmultiplication
Aaddition
Ssubtraction

First is to check if there any bracket and exponents if not skip it.
If there Division then you do first on the question.then if there multiplication then you do it second.Then Final do is addition to solve the question.

(+5) x (-3) + (-6) / (+3)
(+5) x (-3) + (-2)
(-15) + (-2)
= (-17)

Robin's Volume Post

Chapter 7.3



Jumbo:

R=d÷2 V=pi.r.r.h
R=20÷2 V=(3.14x10x10)x40
R=10cm V=12,560cm³


Popcorn Lover's

R=d÷2 V=pi.r.r.h
R=30÷2 V=(3.14x15x15)x20
R=15cm V=14,130cm³

Chapter 7.4



Inside Circle :

R=d÷2 V=pi.r.r.h
R=8÷2 V=(3.14x4x4)x40
R=4cm V=2009.6cm³

Outside Circle :

R=d÷2 V=pi.r.r.h
R=10÷2 V=(3.14x5x5)x40
R=5cm V=3140cm³
3140cm³-2009.6cm³=1130.4cm³

Term 2 Reflection

In this term i did vary well on doing my homework,quiz,and test. Keep all my homework
ready to hand in and practice for my test and quiz. Some of the test were hard but i try to pull through.

I struggled on my math blog because i keep for getting to put in comments weekly and putting homework on it. I was confused on Some of the formulas for cylinder. For the term 3 am going to try harder to get my quiz much better and tests too. and getting better on my on the math blog to get a better mark in math to make my parent happy. math blog i will try to do it more offeted to get a great mark.

The thing i learn this term about in percents,surface area and volume. volume such as the triangle prism and cylinder and rectangular prism formulas Ex for each formulas rectangular lxwxh . Cylinder pi x r xr x h and triangular prism where you do bxh divide by 2,

Robin's Volume Scribe Post

2) Does the volume of a right prism depend on which face is used on the base of the calculations? Use examples to support your position.

This Question i was confused on sorry i didn't answer it .





5)Determine the volume of each right rectangular prism.

A)

L.W.H
3x4=12cm2
12x5=60cm3


L.W.H
3x5=15cm2
15x4=60cm3



B)
L.W.H 6x8=120cm2
120x8=960cm3

L.W.H
8x6=48cm2
48x20=960cm3



8) Nina uses 15 centimeter cubes to make the base of the rectangular prism. Determine the volume if the prism has a total of 5 layers of cubes. Show your thinking

Answer) So you have 5 layer with 15cm2 then you times your centimeter like (15x5)
to get 75cm3.



10) A water through is in a shape of a right triangular prism with base area of 1250 cm2 and a height of 100 cm. How much water can be put in there before it overflows?

Answer) 1250cm2x100cm=125 000cm3
it will be 125 00cm3 before it get overflows.

Here a video to understand more about volume:

Here a link about volume: http://library.thinkquest.org/20991/geo/solids.html

Tell me if i did anything wrong.

Robin's Final Percent Post

~ A percent means out of 100 and it's another name for hundreths which can be represented as a decimal or fraction
~Ex. 65% means 65 out of 100 or 65/100 or 0.65


4.1 Representing Percents

Key Ideas
To represent a percent you can use 100 grid charts. One shaded grid that has all the squares shaded in represents 100%. To show a percent that is larger than 100% you shade in more than one grid. To represent a percent between 0% and 1% you shade in a part of one square.

Fractional Percent - A percent that includes a portion of a percent.
Ex. 1/2%, 0.42%, 73/8%, 125 3/4%, 4.5%
4.2 Fractions, Decimals, & Percents

Key Ideas :
Fractions, decimals, and percents can be used to represent numbers in various situations.
Percents can be written as fraction as decimals.
Ex. 1/2%=0.5% 0.5%=0.5/100 =0.005
150%=150/100 =1.5 or 11/2
423/4%=42.75% 42.75%=42.75/100 =0.4275

4.3 Percent of a Number

Key Ideas :
You can use mental math strageties such as halving, doubling, and dividing by ten to find the percents of some numbers.
To calculate the percent of a number, write the percent as a decimal and then multiply by the number.
Ex.121/2% of 50 = 0.125 x 50 = 6.25
121/2%=12.5 = 0.125

4.4 Combining Percents

Key Ideas :
Percents can be combined by adding to solve problems. 5% + 7% = 12%
To calculate the increase in a number,
~You can add the combined percent amount to the original number: 12% of 100 =0.12 x 100 = 12 100+12=120
~You can multiply the original number by a single percent greater than 100
Percents of percents can be used to determine amounts that result from consecutive percent increases or decreases.

Robin's Percent Sribe Post

Pages 142-143:

3)

a) 300% = 3. 3 x 2000 = 6000

b) 1 + 1/4% = 0.0125. 0.0125 x 60 = 0.75

c) 0.1% = 0.001. 0.001 x 40 = 0.04

4)

a) 20% = 0.2. 0.2 x 60 = 12

b) 250% = 2.5. 2.5 x 400 = 1000

c) 10 + 1/2% = 0.105. 0.105 x 100 = 10.5


10) When water freezes, its volume increases by approximately 10%.

A)By how much does the volume of750 mL of water increase when it freezes?
b) 75mLB)What is the volume of ice created?
825mL

Robin's Pay It Forward

Part 1:
In my thoughts, paying it forward means doing a random act of kindness knowing that you are getting nothing in return. Doing a random act of kindness can be giving your place in line for someone in seems in a rush or opening the door for someone who seems to be loaded with bags. Doing a random act of kindness will let people recognize how to do the same thing to other people which will lead to paying it forward.

Part 2:
My pay it forward act of kindness were helping people shovel their yard, donating to The Salvation Army, and putting up flayers around Brooklands School. We chose these activities because it seems helpful and fun at the same time. We helped people to shovel their yard and helped people who are in need with the donation. We shoveled people's yard, donate to The Salvation Army, and put flayers around Brooklands School. We did out act of kindness in December 18th, 19, and the 20th.

Part 3:

It went pretty smooth but it wasn't all fully groups. Everyone did their job and stuff but in different times. I felt good inside, knowing that I did a good cause in this community. They reacted surprise to see people like us helping them clean their yard up. We didn't really ask to pay it forward since we were kind of nervous.

Part 4:
The idea of paying it forward is important because it lets people be nice to another and to do the same thing to other people which will lead to paying it forward. We think it did since it will tell people to help out one another and be nice to each other.

Robin's Pythagoras

H.W
Pg: 91-94



5) A)

B) 402=1600
75=5625
85=7225

C) A2+B2=C2
402+752=852
(40x40)+75x75)=(85x85)
16002+56252+72252
72252=72252mm

10)
A2+B2=C2
1202+1602=2002
(120x120)+(160x160)=(200x200)
144002+256002+400002
40000mm2=40000mm2


It yes, because it right triangle since a2 plus b2 equals c2.
ex.(144002+256002=400002)



15)
A2+B2=C2
82+62=102
(8x8)+(6x6)=(10x10)
642+362=1002
100cm2=100cm2


Well i think it is a right triangle because 642 plus 362 equals 100cm2


19) Well i got confused on this one so i couldn't answer it .



Here a link: http://www.thebigview.com/greeks/pythagoras.html

Here a video:

Robin's Sesame Street VIdeo Post

Group :Robin,Justin,L,Chris

Part One :
Ratios:

Two term ratio ; Compares 2 quantities measured in the same units. (Eg A:B)
Three term ratio ; Compares 3 quantities measured in the same units.(Eg A:B:C)
Part to part ratio ; Compares different parts of a group to each other.(Eg A;B 2:4)
Part to whole ratio ; Ccompares one part of the group to the whole group. It can be written as a fraction, decimal, & percent.( A:all letters, 5:11)

Rates:Compares 2 quantities measured in different units.(Eg 4km/2hr)
Unit rate ; A rate where the second rate is 1.(Eg 10 letters/ 2hr)
Unit price ; Used when shopping.(Eg $o35/1mL)

Proportional Reasoning: A relationship that says that 2 rates or ratios are equal. It can be written in fraction form.(2/3 = 6/9. (x3)

Part Two :
The Original Video:






Remake:
The Man with the Rates?

Robin's Math Profile

Hello my name is robin, am a grade 8 student. So if anyone that ever ask me if i like math?, well i just say not really,well because when been doing math in grade 7 got me vary confused about the thing i was learning,but i keep trying to do better in math. Doing math is like vary hard questions that sounds like impossible to solve,but every time i did the math like that, I all was learning something new everyday.The best thing I did in math class was doing one of my tests, that i almost got a perfect on. Because this event i was doing in math help me to keep trying in math and don't stop tell i got better on it.


When i was in grade 7 the best unit we did was integer's. I remember that learning about positive and negative. Using bingo chip to find about a zero pairs. There were some unit i been struggling on was fraction like mixed numbers, improper fractions struggling on,but now i kind of got it now but still kind of struggling on it. So i will try harder to practices it so i get it down in math. last year i didn't do all the math book homework so this year am went to try harder to finish it in grade 8 and my other math homework.

So now it grade 8 if i went to be successful math student i will do is get my homework in on time, listening more to the teacher more, never talk when the teacher is talking. So this is what am going to do this year to be a better math student.I went to learn in grade 8 is Algebra so i can be ready in grade 9.

I was a blogger last year but never got to make a post on the blog. But one of the post in the blog is about was about algebra and probability here a link http://room44math09.blogspot.com/2010/05/algebra-and-probability-review.html this post here help me learn more about probability and algebra. blogger help me learning things about math at home if i was not at school or was confused about it.So this year on the computer i went to make lot of post on here so everyone can learn about the math we are doing and so i can make a post this year.