Jae Anne's Algebra Post

Algebra - writing mathematical phrases using letters to represent numbers.
     n + 5 = 14

Variable - a letter that represents a number in an algebraic expression or equation.

     n + 5 = 14

Constant - the integer in an algebraic expression or equation.
      n + 5 = 14
 Expression - pattern-many answers

      3x

Equation - only has one answer and has an equal sign

     3x = 27

Steps to solve:

 - Isolate the variable.

 - Cancel the constant using zero pair.

 - Balance - do it to the other side.

 - Verify to check.

 

One - Step Equations

Two - Step Equations

Here are some videos that might also help you.

Jae Anne's Great Big Book of Integers

Grade 7 Integer Review

 Chapter 1Here are some exercise we did in class.

Zero Pair is when the same negative (-1) and a positive (+1) number are combined, the result is zero.

      example:  -6   +6        +10  -10       19 +19

                        -16  +16       -11   +11    +14  -14      63   -63

Brackets are training wheels.

     example:  (+4) + (-4) = 0

                       (have 4) + (owe 4) = 0

                       4 - 4  <== pure standard form

examples:

-6 +2 = -4

-6 -2 = -8

-6 +10 = +4

Here are the * questions.
When subtracting something isn't there use zero pair.

-3 - (-7) = 4

  

-3 -7 = -10

3 -7 = -4

3 +7 = 10

  



-3 +7 = 4

Chapter 2

Multiplying Integers

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 (+3) = 6
2 grops of (+3)



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

2 groups of (-3)

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

remove 2 groups of (+3)

(-2) x (-3) = 6

remove 2 groups of (-3)

Dividing Integers

How many groups of __ are in __?

How many __'s go into __?

Partitive Division - making parts or group

6 ÷ 2 = 3

-6 ÷ (-2) = +3

Qoutative Division - sharing with groups

  (-6)    ÷       2       =

 share        group

 

When both integers are the same you can use partitive or qoutative division.

(+15) ÷ (3) = (+5) or 15 ÷ 3 = 5

Multiplicative Inverse can help solve 6 ÷ (-2) by finding the answer which is (-3) and switch it places with (-2) that makes 6 ÷ (-3) and the answer is (-2).

Sign Rule

When 2 integers have the same sign (+) ÷ (+) or (-) ÷ (-) the answer would be POSITIVE.

6 ÷ 2 = 3

-6 ÷ (-2) = +3

When 2 integers have different sign (+) ÷ (-) or (-) ÷ (+)the answer would be NEGATIVE.

(-6) ÷ 2 = -3

6 ÷ (-2) = -3

Order of Operations with Integers

(+5) x (-3) + (-6) ÷ (+3)

We can solve this problem by:
1) put brackets where you see multiplication and division happens
     [(+5) x (-3)] + [(-6) ÷ (+3)]
2) solve the ones in brackets
     (- 15) + (-2)
3) find the last answer
     (-17)


Here is a video about multiplying integers

Term 2 Reflection

Term 2 Reflection

In Term 2, I’ve learned about percent, surface area and volume. The lesson that I’m good and did well at is I think finding the surface area and volume of rectangular prism, and triangular prism because I know the formulas and how to do it.
I struggled on converting percents because I always forgot how to convert them to decimal or fraction. I don’t know why I found it difficult to convert when we’re discussing about that but now, I really know how to convert percents into decimal and fraction. Next time, if we’ll take about percents, I won’t forgot how to convert them so I won’t struggle or fail Math just because of percents.

We learned about converting percents and adding percents to another. I also learned the formulas on how to find the surface areas and volume of rectangular prism, triangular prism and cylinder. I think I like this term better than on the first term.

Winnipeg Harvest Visit Manitoba Hunger Free 8-14

What did I learn about Winnipeg Harvest?

I learned that Winnipeg Harvest is a big help for many people especially young children  all around Canada. In Winnipeg Harvest, many people donated goods and basic nutrition kits and every month 56 000 people use Winnipeg Harvest. Many food banks were connected to Winnipeg Harvest. Winnipeg Harvest works with other food banks in Canada and 80 child care agencies. Also if Winnipeg Harvest stopped receiving donations it would be out of food within a week. Many people volunteered to help on packaging the donations they have.

Who does Winnipeg Harvest Help?

Winnipeg Harvest help many people throughout Canada. About 56 000 people get food from Winnipeg Harvest every month. They also gives out 5 500 Basic Nutrition Kits with the food they packaged. Winnipeg Harvest help especially children in the age of 18 and below. They also send food monies for the medical needs of the children.

Where does Winnipeg Harvest get the food it supplies to its users?

Winnipeg Harvest is connected to many food banks in Canada. Many stores and agencies also give foods to Winnipeg Harvest to send to people who need it. Some bakeries donate breads, too, and like Sobeys, Superstore and other stores in Canada. There's also some company that gives them trucks to help sending the foods in Canada. Winnipeg Harvest receives donations everyday and it's very important because if they stopped receiving, they would be out in a week. They have to receive donations everyday.

What are the top 10 items needed in Winnipeg Harvest?
The top 10 items Winnipeg Harvest needed the most are:

• Canned fish and poultry
• Canned fruit and vegetables
• Canned stew, chili,brown beans
• Peanut butter (light)
• Baby food
• Whole grain pasta/Whole wheat pasta
• Rice
• Canned spaghetti sauce or tomatoes
• Cereal
• Canned soup

When you volunteered what do you remember about your job?
When I volunteered in Winnipeg Harvest, what I remembered was how much food they had in their warehouse that they sort on what kind the item is and package them. They have lots of supply of different kinds of food in the warehouse. We volunteered to work on cleaning some bins that was used for recycling foods and sorting different kinds of food like pasta, rice and cereals. Its pretty hard cleaning the bins and those bins are big. Working in Winnipeg Harvest is really hard if not enough volunteers work. Winnipeg Harvest is really a big help to many people in Canada and it's worth it to work and help them work even though its a lot of work to do. I think I would volunteer again next time.



That's not all what Winnipeg Harvest do, click here to know more about it.

Jae Anne's Volume Scribepost

Textbook pg 250 - 252
# 3, 9, 11, and 15

3. Determine the volume of each right prism or cylinder.

a)

V = area of the base x height

    = 15 cm² x 4 cm

    = 60 cm³

b)

V = area of hte base x height

    = 18 cm² x 12 cm

    = 216 cm³

c)

 

V = area of  the base x height

    = 96 cm² x 20 cm

    = 1920 cm³ 

9. How many ways can you build a rectangular prism from 16 centimetre cubes? Use diagrams or centimetre cubes to show your designs.

11.  José is having vegetable soup. The area of the base of the soup can is 10.4 cm², and the height is 10 cm. When José opens the can, he sees that the soup comes up to a height of only 9 cm. What volume of soup is in the can?  

 

 V = area of the base x height

     = 10.4 cm² x 9 cm

     = 93.6 cm³ 

15.  The International Space Station is shaped like a cylinder that has a cross-sectional area of 615 m² and a length of 44.5 m. The living space for the astronauts is 425 m³. What percent of the volume of the space station is used for living?

V = area of the base x height

    = 615 m² x 44.5 m
    = 27367.5 cm³

I can't find the percent  of the space station used for living.. I tried what we did on percents but I can't.. I'm sorry.. :(

Here's the correct answer nmber 15.

425/27367 = 0.155 or 0.16

0.16 x 100 = 1.6%

Here is a  link to know more about volume.

Cylinder Volume and Volume Problems

Chapter 7.3

V = πr²h
    = (3.14 x 4²) x 10             r = d/2
    = 50.24 m² x 10 m             = 8/2
    = 502.4 m³                          = 4 m

    = 502.4 m³/2
    = 251.2 m³



Chapter 7.4

V = πr²h

    = (3.14 x 0.5²) x 10

    = 0.785 m² x 10 m

    = 7.85 m³

V = πr²h

    = (3.14 x 0.4²) x 10

    = 0.5024 m² x 10 m

    = 5.024 m³

    = 7.85 m³ - 5.024 m³

    = 2.826 m³

 

Final Percent Post

Percent
 - means out of 100
 - another name for hundredths
 - 65 % means 65 65 out of hundred or 65/100


Chapter 4.1 Representing Percents
 - you can represent a percent by using grids.
ex. If you have a 155% and you need to present it using grids, you have to have 2 100 grids to show it. One grid has 100 boxes which means a 100%, so you have to shade 1 whole grid and in the second grid, shade 55 boxes.


Chapter 4.2 Fractions, Decimals, and Percents
 - you can convert or represent decimal, fraction and percent.
ex. 36% = 0.36 = 36/100 or 4/25


Chapter 4.3 Percent of a Number
 - you can find the percent of a number by writing the percent to decimal then multiply it to the number.
ex. 160% of $53.27 = 1.60 x 53.27 = $ 85.23


Chapter 4.4 Combining Percents
 - you can combine percent to another percent to solve problems. (5% + 7% = 12%)
ex. A girl bought a shoes that costs $150. Adding to this cost are the P.S.T. which is 7% and G.S.T. 5%. You may add the P.S.T and the G.S.T which is 12 % and the whole cost is 112%. Divide the 112% to hundred, 1.12, then multiply it to the cost of the shoe, $150 x 1.12 is equal to $168. This is the amount that you need to pay.


Here is the link to my Percent Scribe Post.

Jae Anne's Pay It Forward

Part 1

PAY IT FORWARD is a movie that shows how an eleven year old boy, Trevor, show an act of kindness to three other people that don't expect anything in return. In the movie, Trevor and his classmates in Social Studies have given an assignment on "Think of an idea to change our world - and put it into action." Trevor helped 3 people: (1) Jerry, a homeless man, (2) Mr. Simonet, his teacher that gave the assignment and (3) Adam, his friend that was bullied. When he tried to help his friend, he was stabbed and die. Many people came to their house to show how they feel for Trevor and they put flowers on their yard.



Part 2

My Pay It Forward act of kindness was babysitting my 1 year and 10 mos. old cousin. I chose this activity because I liked to help my auntie for having time for herself after work by babysitting my cousin. I looked after my cousin on in their house for 2 hours last Saturday, December 18 2010. I had a great  for looking after him because I learned a lesson on doing this.

                                         This is when he wants to slide.

Part 3

It went really well when I babysit my cousin. I fed him, and I played with him. He is really cute and he was behave when i was feeding him rice. He learned some new letters and he can say "mommy" and "daddy" clearly now. I felt something when I was doing it but I can't explain what I felt. Before my time was over, he was so sleepy so I carry him to their room and wait until he really was slept. My cousin seems to be happy for babysitting him for two hours. And before went home, I told my auntie to pay it forward to other people to help them on any way she wants. My auntie really appreciate what I did so she told me that She will pay it forward to other people.


Part 4

The idea of "Pay It Forward" is important because anyone in the world can make a  difference to someone's lives.  We can change the the world by being kind to someone else and to pass it forward. And I think  my act of kindness to my auntie for babysitting my cousin has made a difference because my cousin can call her now to mommy instead of calling her "ta" because he heard us calling my auntie "tita". (ta is tita, in english - auntie)


I don't have a picture with me because he really wants to play more... I'm sorry.

Percents

Finding the percent of a number.

a)

b)

c)

a)

b)

c)

Here is a link to help you find the percent of a number.

And a  video to help too.

Jae Anne's Estimating Square Roots

Estimating Square Roots

pg. 99 # 12 & 13

12. While stopping online, Ji Hun finds a square rug with an area of 11 m² . He needs to know if it will fit in his 4 m x 5 m bedroom.

a) Estimate the side length of the rug, to one decimal place.

√9          √11          √16

   3           3.2             4

b) Check your estimate with a calculator.

√11 m² = 3.3

c) Will the rug fit? Explain.

Yes the rug will fit since its side length is smaller than the shorter side of the room.

13. Stella is planning an outdoor wedding. She would like a square dance floor with an area of 115 m².

a) Determine the side length of the dance floor to the nearest tenth of metre.

√115 m² = 10.7

 
b) What are the two side lengths the dance floor can have that are closest to to what she wants?

10 m or 11m

c) What are the two areas for the dance floor that Stella can choose from?

100 m² or 121 m² 

d) Which area will Stella choose? Explain.

She will choose the 121m dance floor since it is much closer to her desired size.

 

 

Jae Anne's Sesame Streeet Video

Group Members
Jam D
Ysabelle V
Jae Anne D

Part 1

Ratio - compares quantities measured in the same units.
Two - Term Ratio - compares two quantities measured in the same units.
        ex. 2:3, 7:10
Three - Term Ratio - compares three quantities measured in the same units.
        ex. 2:4:7, 5:8:11

Rate - compares two quantities measured in different units.
Unit Rate - a rate in which the second term is one.
        ex. 2hr/km, $1.80/pen
Unit Price - a unit rate used when shopping.
        ex. $56/kg, $7/L

Proportion - a relationship that says ratio and rate are equal

Jae Anne's Math Profile

Hi! My name is Jae Anne. I'm a Grade 8 student in Sargent Park School.If someone ask me if I like math, Iwould say honestly NOT REALLY, because math hurts my brain.Solving equations, formulas or even small numbers to compute. But I like puzzles, playing numbers, sometimes I like solving algebra things. I remember something that make me like math. When I was Grade 6, we had an activity row by row. It is about integers that our teacher will give us. After my groupmates are finished, it's my turn now. I'm so nervous when going to the working area. When the teacher gave us the problem, I start solving. After few minutes, others are finished and they are passing the answer, there I am ALMOST done. When I finished it, I pass it fast to the other corner of the room so our teacher can see. I'm so nervous when our teacher was looking at our answers. In my mind I thought we lost because I am the last person to finished the question and one of my opponent is the smartest person in math in our class, but... here comes the result...our teacher points out his finger to our answer and say "They are the only one who got the correct answer." I was so surprised that we were the only one group that was correct. YESSSS!!!


Last year, I am first year hhigh school but here in Canada, it is Grade 7 and that's my last year in Philippines. I really like fractions, and integers. I like fractions on how they were written and solve. I like integers because they were cute. It have positive and negative. I am struggling with pi or 3.14. I can't get it even my classmate help me. This year I'll try to concentrate on listening carefully and remeber all the things that have discussed.


This year, I am Grade 8. I will finish all jobs, activities, projects, and homeworks needed for this year's math class. I'll do my best to pass this Math subject. And I like to learn something new this year to be succesful before going to Grade 9.


I'm not a blogger last year. I didn't study in Sargent Park Scholl last year because I'm in Philippines and I went here in Canada last June 18. So, I'm new here and start to study Grade 8. But I think blogging or blogs can help me to be succesful this year. Blogging is where we can learn new something that maybe new to us. I'm looking forward to this blog to the end of this year.