Ivan's Great Book Of Integers.

Chapter One:
Grade 7 integer review.

(+4) + (-2) = +2
Positive (4) Negative (2) = Positive 2
Have 4 Owe 2 = have 2
Standard Form : 4 - 2 = 2.

Making A Zero Pair:
An example of a zero pair is (+1) + (-1).
A negative and a positive can make a zero pair because it is oppisite from each other.

Chapter Two Multiplying Integers:
Sign Rule:
Even: When you have an even amount of negative factors, the product is positive.
Odd: When you have an odd amount of negative factors, the product is negative.

(+2)x(-3)=-6
2 Groups Of (-3)=-6
---
---

(+2)x(+3)=+6
2 Groups Of (+3)=+6
+++
+++

(-2)x(+3)=-6
Remove Two Groups Of (+3)=-6
---
---

(-2)x(-3)=+6
Remove Two Groups Of (-3)=+6
+++
+++

Chapter Three Dividing Integers:
Sign Rule: If you have no negative or an even amount of negative signs in a division question, the quotient is positive.

2 Types Of Division:

Partitive Division:
making parts

EX.
6/2=3
6/-2=-3

Quotative Division:
Sharing your total w/ groups

EX.
(-6)/2=-3
(-6)/-2=+3

Chapter Four Order Of Operation:

Brackets
Exponents
Division
Mutiplication
Adding
Substracting

(+5)x(-3)+(-6)/(+3). First you always follow BEDMAS, so division is first in the question, after you multiply, and do the adding.

EX.
(+5)x(-3)+(-6)/(+3)=-17
(+5)x(-3)+(-2)
(-15)+(-2)
-17 is your final answer.

Ivan's Term 2 Reflection.

What I’ve learned in term two was, total surface area, and volumes. I’ve struggled a lot in surface area at first I didn’t get it until Mr. Harbeck explained it right. Volume I was comfortable with, but the cylinder. I’ve struggled a lot on cylinder, because I hate them. But once I got to know the formula, I studied it so I can learn it better. For the next term, I will try my hardest to get my grades up. I did well on the Surface Area because I understood them a lot, but the net was complicated, we had to draw them out. I didn’t like the net at first, until I practiced drawing the nets, I got to know the nets a lot better, and in term 2 my test improved. This term, I would like to work better, and improve my test marks a lot better.

I will post audioboo once I get that flash thingy for the computer.

Total Surface Area

The length of a rectangular prism are 4 cm and 8 cm and 1 cm. What is the Total Surface Area?

1st way:

L x W = A

Top: 8x1 = 8cm2

Top: 8x1 = 8cm2

Front: 8x4 = 32cm2

Front: 8x4 = 32cm2

Side: 1x4 = 4cm2

Side: 1x4 = 4cm2

T.S.A = 8 + 8 + 32 + 4 + 4 = 88cm2

The total surfce area is 88cm2

The leanths of a rectangular prism are 2 cm and 6 cm and 2 cm. What is the Total Surface Area? Use lateral area

LxW = A

2x2 = 4cm2

2x2 = 4cm2

^sides.

T.S.A = 48cm2+ 4cm2 + 4cm2 = 56cm2

Comment, if I did anything wrong or something. Thanks, byee

Volume post:

v = pixrxrxh

v = 3.14x2x2x10.5

v = 131.88

Ivan's Math Pages 142-143

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

7) Two hundred tickets are being sold for a school draw.

a) What is your chance of winning one ticket? Express your answer as a percent.

MI: 200 tickets, once chance ticket, % = 100

SS: 0.5% of winning one ticket.

b) How many tickets would you need to purchase to have a 2.5% chance of winning ?

MI: 200 tickets, one chance ticket, %= 100, two tickets of winning.

SS: You need two more tickets to have a chance of winning 2.5%.

( If I made any mistakes, just tell me and I'll work on it. :) )

Ivan's Pay It Forward

Part one:

Trevor, who is an eleven year old child. He was given an assignment from his social studies teacher, Mr. Simonet to make a difference and change the world. Trevor came up with an idea "Pay It Forward". Pay It Forward is when Trevor helps three people, who then helps three more people, and so on.

Part two:

My group, Kyle, Ajay, Justin S, and myself decided to shovel up peoples driveways and pathways. We chose this activity because, it's fun shoveling, and it's winter time, and some people didn't even shovel up their pathways and driveways. We decided to help the community. We decided to do this activity on Saturday, December 18.

Part three:

Our kindness helped a lot of people. My group and I went door to door and shoveled peoples paths. All of the peiple were suprised in what we did were doing for them. After, we told people to Pay It Forward, they didn't know what it meant, so we had to explain it.

Part four:

The idea of Pay It Forward is to help people and make a difference in the world. Our act of kindness has made a difference in peoples lives, helping them has also made a difference in our lives.

Pages 98-100 #'s 7 and 9

7) Identify the whole number with a square root between 11 and 12.

11 12

121 144

Between the numbers are: 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143. There are 22 possible square roots between 11 and 12.

9) What are all the whole possible numbers that have a square root between 4 and 5.

4 5

16 25

Between 4 and 5 are: 17 18 29 20 21 22 23 24. There are 8 possible square roots between 4 and 5.

Remember; To do pages 98-100 1 to 24 for math!

Square roots link : http://www.mathsisfun.com/square-root.html

Video : http://www.youtube.com/watch?v=iFPsqk8MYj0

Sorry, if the first one is side ways. My blog was lagging.

Ivan's Sesames Street Video

Ivan's Math Profile

Hello, my name is Ivan Salvador. I am a student in grade 8. If someone asked me if I like math I would say yes, because I like math. Best subject. Even though I’m not as good as others, I try to do my best. The thing I like to do in math the best is integers, cause their easy for me. I liked the integer’s event, because I like adding.

In grade 7 the best unit I studied was integers, I did well on integers because it was like addition and subtraction. The unit, I’ve really struggled with was algebra and the circumference. I struggled with it because it was hard for me to understand. This year, I’ll try to do my best to understand those two.

This year to become more successful is to listen, do work, and study hard. Also, ask questions about problems that struggle me a lot.

My favorite post from last year was:
http://room43math09.blogspot.com/2010/06/measures-of-central-tendancy_18.html
Blogging helped me a lot, even though I couldn’t really go on the computer. This year, I would like to do more blogging.