Louis' Algebra Post

One step Algebra Equations

Algebra - Writing mathematical phrases using letters to represent a number

eg. 2 + x = 3, 2 - x = 1

Variable - A letter that represents a number algebraic equation and expression

eg. x + 1 = 3

Constant - The integers in an equation and expression

eg. 18 + x = 8

Expression - pattern (many answers)

eg. 8x

Equation - Has only one answer. Also has a equals sign : =

eg. 8x = 16

To solve one steps you need to

1. first you need Isolate the variable
2. make a zero pair with the constant
3. Balance the equation
4. Verify

One-Step Equations :

To solve two steps you need to

1. Isolate the variable
2. Cancel the constant
3. Balance
4. Simplify the variable
5. Balance
6. Verify

Two Step Equations :

One-Step Equations

Two-Step Equations

Term Two Reflection

My audioboo couldn't upload so i just put this.

Term Two Reflection

This is my Term Two Reflection on math, we have learned surface area and volume is term. The unit that I did really well was volume, it was easy for me and I understand it well. I could help others and I could pass my test with a good mark. I really don’t have a unit that I struggled with, the units were easy for me. The thing that I can do better for the next term is to do my homework, take time to check my work in tests, and to listen more. I learned how to find the surface area and the volume in shapes. For surface area you have to find each face of the shape and add it together. For volume you have many things you have to do. You can find the volume of a rectangular prism, triangular prism, and a cylinder.

Louis' Great Big Book of Integers

Chapter 1

Grade 7 Integer Review

Questions for class

-6 - (-4) = -2

-10 + 6 = -4

6 - 7 + 2 = 1

14 - (-3) = 4

- 3 - (-7) = 4

- 3 - 7 = - 10

3 - 7 = - 4

3 + 7 = 10

- 3 + 7 = 4

Chapter 2

Multiplying Integers

(+2) x (+3) = 6

"make 2 groups of (+3)"

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

"make 2 groups of (-3)"

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

"remove 2 groups of (+3)"

(-2) x (-3) = 6

"remove 2 groups of (-3)"

Sign Rule (negative signs)

Even = When you have a even number of negative factors your product is positive.

Odd = When you have a odd number of negative factors your product is negative.

Chapter 3

Dividing Integers

Partitive Division - when you use groups to find your quotient.

6 ÷ 2 = 3

(-6) ÷ (-2) = 3

Quotative Division - share numbers with specific groups

(-6) ÷ 2 = -3

Chapter 4

Order of Operations

(+5) x (-3) + (-6) ÷ (+3)= ?

1. Always do multiplication and division first
2. Put square brackets around (+5) x (-3) ex. [(+5) x (-3)]
3. Put square brackets around (-6) ÷ (+3) ex. [(-6) ÷ (+3)]
4. Solve (-15) + (-2) = -17

3 Cylinder Problems

Cylinder Problems and Volume Problems









A) V = pi . r . r . h
V = 3 . 2 . 2 . 10
V = 12m^2 . 10
V = 120m^3

B) V = pi . r . r .h
V = 3.14 . 2 . 2 . 10.5
V = 12.56m^2 . 10.5
V = 131.88m^3

D/2 = R
8/2 = R
4cm = R

V = pi . r .r .h
V = 3.14 x 4 x 4 x 40
V = 50.24 x 40
V = 2009.6cm^2

Final Percent Post

1) This chapter was about decimals, percents, and fractions. We learned how to show percents in different ways. We also learned about GST and PST.

4.1 Representing Percents

You can represent percents using hundred grids

eg. 50%

4.2 Fractions, Decimals, and Percents

Fractions and Decimals can be also written as a Percent.

eg. 50% = 1/2, 0.5

4.3 Percent of a number

Using mental math strategies you can find the percent of a number.

eg. halving, doubling, or dividing by 10

You can also find the percent of the number by converting the percent to a decimal and multiplying the number.

4.4 Combining Percents

You can combine percents by adding to solve some problems.

eg. 5% + 7% = 12%

2) Here is the video I made for percents.

3) Here is a link to a Percent Scribe Post

4) Here is a link about Percents

Louis' Pay it Forward

Part 1:
The movie Pay it Forward is about a kid named Trevor who tries to make a difference. The idea of pay it forward is one person helps three other people and then it goes on. The first person Trevor tried to help was a homeless person, he let him in his house, feed him, and gave him money. The second person he tried to help was his Social Studies teacher, Trevor tried to make him go out with his mother. The third person he tried to help was friend because he was being bullied, but at the end when Trevor tried to help, he died.

Part 2:

What was your Pay It Forward act of kindness?
My Pay it Forward act of kindness was helping clean up my school, Sargent Park.

Why did you choose this activity?
I picked this activity because I saw that were lots of mess in the school so I decided to help them out.


Who did you help?
I helped the janitors at Sargent Park.



What did you do?
I helped the school by clean some classrooms in Sargent Park School.

When did you do you act of kindness?

I did my act of kindness on Friday Dec 17, 2010.

Part 3:
How did your act of kindness go?
I thought my act of kindness went very well, it went greater then I thought i was going to be.



What Happened?
My friends and I helped out and cleaned the school.



How did you feel?
I felt good helping out clean my school.



How did the person or people react?
The janitors of our school were happy for the help we did.

Did you ask the person or people to "Pay It Forward"?
Yes we did, my friend Patrick did it for us.



How did they react to your request?
He said that its good that were doing this because we can help each other.


Part 4:

Why is the idea of "Pay it Forward" important?
The idea Pay it Forward is important because it important to help each other so then our life well be easier.

Has your act of kindness made a difference?

I hope my act of kindness made a difference, if it didn't its okay at least I helped out my school.

Louis' Homework book: 30 questions 2, 3, 4

Homework Book Pages 30 questions 2, 3, 4

2) Use the relationship to determine the length of C in each triangle, to the the nearest whole number. Show your work.

A)

b2=c2 - a2

b2=262 - 242

b2=676 - 576

b2=100m2

square root 100 m2 and it becomes 10m

B)

a2=c2 - b2

a2=392 - 152

a2=1521 - 225

a2=1296 cm2

square root 1296 cm2 and it becomes 36cm

3) Determine the length of each hypotenuse. Show your work.

A)

a2 + b2 = c2

402 + 92 = c2

1600 + 81 = c2

1681 cm2 = c2

square root 1681 cm2 and it becomes 41cm

B)

a2 + b2 = c2

352 + 122 = c2

1225 + 144

1369m2 = c2

square root 1369 m2 and it becomes 37m

4) What is the length of each hypotenuse, to the nearest centimeter? Show your work.

A)

a2 + b2 = c2

82 + 92 = c2

64 + 81 = c2

145 = c2

square root 145 cm2 and it becomes 12.04cm

B)

a2 + b2 = c2

102 + 62 = c2

100 + 36 = c2

136 cm2 = c2

square root 136 cm2 and it becomes 11.66 cm

Homework, November 4, 2010

Homework
Show you know

1) A triangle has side lengths of 12cm, 16cm, and 20cm.
a) What are the area of the three squares that can be drawn on the sides of the triangle?
b) Is the triangle a right triangle? Explain

2) The sides of a right triangle is 9cm, 12cm, and 15cm.

a) Sketch a picture of the triangle. Draw a square on each side of a triangle.
b) What is the area of each square?
c) Write an additional statement using the areas of the 3 squares.


Answer

1) a) 144cm2=12cmx12cm
256cm2=16cmx16cm
400cm2=20cmx20cm
b) yes this triangle is a right triangle because it has a right angle (90 degrees)

2) a)

b)

c) a^2+b^2=c^2

12^2+9^2=15^2

144+81=225

225=225

Louis' Sesame Street Video Post

Group members: Chris A, Karl N, Louis D

Part 1

Two-Term Ratio : compares two quantities measured in the same unit.

ex.

Three-Term Ratio : compares three quantities measured in the same units.

ex.

Rates : compares two quantities measured in different units.

ex.

$3.00 per 20g or $3.oo/20g (can be used in shopping)

Unit Rate : a rate in which the second term is one

ex.

75 words typed in one minute or 75 words/minute

Unit Price : a unit rate used when shopping

ex.

per 100g or per 100ml

Proportional Reasoning : a relationship that says two ratios or two rates are equal

ex.

Part 2

Professor Grover teaches a class on school. He gets facts about school wrong and the children have to correct him all the time.

Part 3

Louis dela Pena's Math Profile

Hi, my name is Louis. I am a grade 8 math student. If someone asked me "Do you like math?" I would tell them yes, I love math! I like math because its easy for me at times, math is my strongest subject. The best thing I ever did in math class is blogging. I like blogging because its fun, easy, and if I did help I can just ask my brother.

In grade 7, the best unit I learned was adding and subtracting fractions. I think I did very well in this unit because I listened and when Mr.Isfeld showed us how to do it, I caught on really easily. The unit that made me struggle was surface area, it made me struggle because the formulas were confusing. This year I'll listening more so I won't get confuse.

This year in grade 8, I will try to finish my homework so that I wouldn't hold back the class and follow on with the unit. I will also try to finish blogs so that the people that weren't at class can see what we did. I'm looking forward to learn more algebra this year and becoming better then my brother.

In grade 7 when we blogged I think my first blog was the best one I did because it was my first blog and I thought that i might have done something wrong but didn't. Blogging has made me a better student by being able to learn from others when they solve a problem their way so I have an idea of how to do a question like that again. In math class I would still want to learn blogging so that I can get better at it.