Area of Rectangular and Triangular Prisim's

1. BxH/2

11x5/2=27.5cmx2=55

LxW

9x15=135x2=270cm

15x5=75cm

55+270+75=400

TSA=400cm

2. LxW

12x5=60x2=120cm

8x5=40x2=80cm

12x8=96x2=192cm

120+80+192=264cm

TSA=264cm

Emily's Final Percent Post

percent means out of 100
Another name for hundredths
65% means 65 out of 100

Fractional percent- a percent that includes a portion of percent

Eg. 7 3/8%, 4.5%

Fractions, decimals and percents can be used to represent numbers in various situations

Percent can be written a fraction and as a decimal

Eg. 1/2+=0.5

You can use mental math strategies such as halving, doubling and dividing by 10 to find the percent of a number

To calculate the percent of a number write the percent as a decimal and then multiply by the number

Eg. 12.5%of 5=0.125x50=6.25

Percents can be combined by adding to solve problems
5%+7%=12%

My percent Video

Finding Side Lengths

A baseball diamond is a square. How could you determine the distance
from second base to home plate? How many different strategies can
you develop?Determine the length of leg s of the
right triangle

a2+ b2= c2

(27x27) + (27x27) = c2

729m(squared) + 729m(squared)

c21458= c2

1158cm(squared

c238.18m= c

• The Pythagorean relationship can be used to determine the length of the hypotenuse of a right triangle when the lengths of the two legs are known.

a2+b2=c2

3cm+4cm=c2

3x3=9

4x4=16

9+16=25cm

25 square root=5

c=5

• The Pythagorean relationship can be used to determine the leg length of a right triangle when the lengths of the hypotenuse and the other leg are known.

p2 + q2 = r2
p2 + 122 = 152
p2 + 144 = 225
p2 + 144 - 144 = 225 - 144
p2 = 81
p = √
___
81
p = 9

1. Jack must determine the missing side length of a triangle. He decides to draw it and then measure it, as shown. Do you agree with the method that Jack is using? Explain

I do not agree because, one it would take to long, two when I drew a triangle on grid paper it was very hard to measure the hypotenuse, also its just a lot quicker to use Pythagorean relationships.

2.Kira calculated the missing side length of the right triangle.

y2 = 52+132

y2 = 25
169y2 = 194y2

≈ 13.9

The length of side y is approximately 13.9 cm. Is Kira correct? If she is correct, explain how you know. If she is incorrect,explain the correct method.

Kira is correct because 5x5=25 and 13x13=16

169+25=194

194 square root= 13.9

3. Determine the length of each hypotenuse.

a)

a2+b2=c2

a=12cm 12cm+16cm=c2

b=16cm 12x12=144cm

20cm 16x16=256

144+256=400

400 squared=20

b)

c2-a2=b2

a=16m 30m-16m-c2

b=25.3m 30x30=900

c=30m 16x16=256

900-256=644

644 square root=25.3

4. What is the length of each hypotenuse?
Give your answer to the nearest tenth of
a centimetre.

a)

a=6cm a2+b2=c2

b=7cm 6cm+7cm=c2

c=9.2cm 6x6=36

7x7=49

36+49=85
85 square rooted=9.2

b)

c2-b2=a2

a=7.5cm 11cm-8cm=a2

b=8cm 11x11=121

c=11cm 8x8=64

121-64=57

57 square rooted=7.5

Emily's Sesame Street Video Post

Group- Cookie monster video
Suzie
Emily

Ratio-

two term Ratio- compares two quantities measured in the same units
three term Ratio- Compares three units measured in the same units
part to part Ratio- Compares different parts of a group
Part to whole Ratio- Compares one part of a group to a whole
Examples: 2:3, 2:3:4 boys:girls.

Rate-

rate- Compares 2 quantities measured in different units
unit Rate- A rate in which the second term is one
unit price- A unit used when shopping
examples: 72 beats/1min 20 km/ 1h

Proportion-

proportion- A relationship that says that 2 ratios or 2 rates are equal
example: How much will 12 mp3 players cost if 3 cost 75$ Mp3 12
3 300$

Estimatating using perfect squares, prime factorization and number line

Homework from yesterday
- Estimating using perfect squares


200- in between the perfect squares 196 and 225.
- 225 is bigger than 200 so that number won't work
- so that leaves us with 196 aka 14x14
- If 196 is 14x14 that means that 200 will be 14._x14._=200 because we know that 225 which
Is to big being 15x15 or the next highest perfect square.

37-in between perfect squares 36 and 49
- 49 is bigger than 37 so it won't work
- which leaves us with 36 aka 6x6
- so if 36 is 6x6 that means that 37 will be 6._x6._=37 because we know that 37 which
to big being 7x7 or the next highest perfect square

850- in between perfect squares 841 and 900
- 900 is bigger than 850 so it won't work
- which leaves us with 841 aka 29x29
- so if 841 is 29x29 that means that 850 will be 29._x29._=850 because we know that 900 is
to big being 30x30 or the next highest perfect square

77 - in between perfect squares 64 and 81
- 81 is bigger than 77 so it won't work
- which leaves us with 64 aka 7x7
- so if 64 is 7x7 that means that 77 will be 7._x7._=77 because we know that 81 is
to big being 8x8 or the next highest perfect square

Number Line

-1-25
-Different colours for the pefect squares
-show what x what = the number your trying to get to

Im sorry my computer won't let me put pictures or vidoes.

so heres a link for a Prime Factorization video.
and another link for prime factorization which is a website which has pictures
and then here is my actual link (make sure to turn off the volume if the play the game)

Suzie's Sesame Street Video Post

Part 1:

Members:
Suzie: Cookie Monster
Emily: Camera person and a person who doesn't know about rates.

Ratio:
Two-term ratio: Compares two quantities measured in the same units.
Three-term ratio: Compares three quantities measured in the same units.
Part to part ratio: Compares on part of a group to each other.
Part to whole ratio: Compares one part of a group to the whole group. It can be written as a fraction, a decimal or a percent.
Examples: 2:3, smart people: not so smart people, red:blue:white.

Rate:
Rate: Compares two quantities measured in different units.
Unit rate: A rate in which the second term is one.
Unit price: A unit rate mostly used in shopping.
Examples: 600km/h, 2.25/box.

Proportion:
Proportion: A relationship that says two ratios or two rates are equal.
Examples: 2/4=1/2 , 3/6=1/2

Part 2: One of the original Cookie Monster videos.


Part 3: Rate cookie

Emily's Math Profile

Hi my name is Emily. I go to Sargent Park school and am in grade 8. If I were asked if I liked math I would have to d=say it depends on the teacher. Take Mr. Isfeld for example, Sometimes he scared me. Sometimes he was hard to follow. But mostly he was a ver good teacher. Now Harbec, I have heard very good things about you and I hope I have just as good a year as my sister did.

The unit I did best in last year was Mean, median and mode because I liked how easy and striaght forward it was. I struggled in most-no all of the math units last year. But the one that was the hardest was multipliying decimals, fractions and mixed numbers. It was very complicated for me because whenevr I thought I thought I had it right I was still doing something wrong. What I could do this year in grade 8 to help me understand....

1. Pay extra close attention in class
2. Make sure I understand all my homework
3. Ask questions even if Im scared to

What could I do yo become a better student....

1. Stay organized
2. Keep track of unfinished work
3. Keep track of finished work.
4. Do all homework
5. Studie for tests


This year I dont know what I want to learn about. But whatever it is I hope its not to hard. This is a blog I worked really hard on last year. Its an exam review for circumference and area of a circle. Blogging helps me to get better at working with the computer and is helpful if I dont have the math homework assigned for the day. I want to find some helpful math websites which I could use if I dont understand something in math on the computer.