Volume Post

Chapter 7.3


a)V=A of BxH
V=78.5cm2x23cm
V=1805.5cm3

A of B= pi x r x r
A of B= 3.14 x 5 x 5
A of B= 78.5cm2

b)V=A of BxH
V=615.44cm2x12cm
V=7385.28cm3

A of B= 78.5cm2
A of B= 3.14 x 14 x 14
A of B= 615.44cm2

c)V=A of BxH
V=0.785m2x1.5m
V=1.1775cm3

A of B= pi x r x r
A of B= 3.14 x 0.5 x 0.5
A of B= 0.785m2

Chapter 7.4



Inner Tube:

r=d/2
r=8/2
r=4cm

V= pi x r x r
V= 3.14 x 4 x 4
V= 2009.6cm3

Outer Tube:

r=d/2
r=10/2
r=5cm

V= pi x r x r
V= 3.14 x 5 x 5
V= 3140cm3

3140cm3 - 2009.6cm3 = 1130.4cm3

Casey's Great Big Book of Integers

Chapter 1 INTEGERS

Grade 7 Review:

- Number line

- Integer chips

- O = POSITIVE 1

- O = NEGATIVE 1

- positive and negative numbers

- zero pairs OO

Chapter 2 MULTIPLYING INTEGERS

Sign Rule:

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

Chapter 3 DIVIDING INTEGERS

*When you have an odd number of negatives in a division question the quotient is negative*

Chapter 4 ORDER OF OPERATIONS WITH INTEGERS

Brackets

Exponents

Division

Multiplication

Addition

Subtraction

(+5) x (-3) + (-6) / (+3) =

first you always follow BEDMAS!

so division is first in the question

after you do the muliplication

and finally you do the addition so it should look like this:

and p.s always re write the question.

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

(+5) x (-3) + (-2)

(-15) + (-2)

(-17)

Daniel's Great Big Book of Integers

Chapter 1 Grade 7 Integer Review

(+4) + (-2) = +2
Positive (4) and Negative (2) = positive 2
have 4 and owe 2 = have 2
Standard Form: 4 - 2 = -2
Make zero pairs:

-16 = +16, -5 = + 5, +6 = -6, -2 = +2,

-10 = +10, +3 = -3, +11 = -11, -9 = +9


CHAPTER 2 Multiplying Integers

(+2)x(+3) = +6
(2)x(3) = 6
(2)(3) = 6 *Standard form*
2(3) = 6


(+2)x(+3) = +6
2 groups of (3)=+6

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

(-2)x(-3) = +6
remove 2 groups of (-3)=+6

(-2)x(+3) = -6
remove 2 groups of (+3)=-6

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.

Chapter 3 Dividing Integers

Sign Rule: If you have no negative or an even number of negative signs in a division question, the quotient is positive.

There are 2 types of division
Partitive Division or making parts
6÷3=2 ,
how many groups of 3 are in 6?

Quotative Division or sharing your total with groups
6÷3=2 , share 6 with 3 groups

6÷2 and -6÷ (-2) will give you the answer of 3 because the questions has no, or an even amount of negative signs.
(-6)÷2 and 6÷(-2) will give you the answer of -3 because the questions have an odd amount of negative signs


Chapter 4 Order of Operations with Integers

The order of Operations is called BEDMAS : Brackets, Exponents, Division, Multiplication, Addition, Subtraction

(+5) x (-3) + (-6) ÷ (+3)
(+5) x (-3) + (-2) [solved division first]
(-15) + (-2) [solved multiplication after]
= (-17) [solved addition]

Volume Post

Textbook

Chapter 7.3
4.
a)

v = π.r.r.h
v = (3.14x5x5) x 23
v = 78.5 x 23
v = 1805.5cm3


b)

v = π.r.r.h
v = (3.14x14) x 12
v = 615.44 x 12
v = 7385.28cm3


c)

v = π.r.r.h
v = (3.14x0.5x0.5) x 1.5
v = 0.785 x 1.5
v = 1.1775m3


Chapter 7.4
3.
a)

v = (bxh÷2) x h2
v = (1.4x1.7÷2) x 1.7
v = 1.19 x 1.7
v = 2.023m3

Link
http://www.math.com/tables/geometry/volumes.htm

Video

Term 2 Reflection

In term two for math, we learned how to convert fractions, percents and how to find the volume and surface area of prisms. I found finding the volume of prisms the easiest topic that we learned in math because, for me it was the most interesting and I was better at it than the other ones. In term two my math grade didn't go up like I hoped it would, because I didn't do all the blog work I should have. Next term I'm going to try to get a better math mark by doing way more blog assignments and completing more homework.

Diana's Great Big Book of Integers

Chapter 1
Grade 7 Integer Review:


(+4)-(-4) =0
Positive 4 subtract Negative 4 = 0
You have 4 and you owe 4 = 0 or none

(+6) + (-2) = +4
Positive 6 and Negative 2 = Positive 4
You have 6 and you owe 2 = have 4

Zero Pairs:

-6=+6

-20=+20

-10=+10

-5=+5

-1=+1

-4=+4

-50=+50

Chapter 2
Multiplying Integers:

SIGN RULE:
Odd: When you have a odd number of negative the product is negative.
Even: When you have a even number of negative factors the product is positive.




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

(+2)x(+3)=
2 groups of (+3)=(+6)



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

(-2)x(-3)
2 groups of (-3)=6

Chapter 3
Dividing integers:
SIGN RULE:
If you have no negative or an even number of negative signs in a division question, the quotient is postive.

There are 2 types of division:
Partitive division:
Partitive division is making parts.
Example:
6 divided by 2= 3

6 divided by -2= -3


Quotative division:
Quotative division is sharing your total, with groups.
Example:
(-6) divided by 2= -3

6 divided by (-2)= +3

Chapter 4

Use Badmas:
B ...stands for brackets
E ...stands for exponents
D ...stands for division
M ...stands for multiplication
A ...stands for addition
S ...stands for subtraction
(Use in order)

If I had to solve this problem:
(+5) x (-3) + (-6) ÷ (+3)=
First I would put brackets around, (-6)÷(+3). Then solve it.
[(-6)÷(+3)]=(-2)
Now the question would be:
(+5) x (-3) + (-2)=
Multiplication is next:
(+5) x (-3)= (-15)
Now Answer:
(-15) + (-2)= (-17)

Term 2 Reflection.

Hello, My name is Diana Rodrigues and I’m a grade 8 student. This term in math we did converting fractions, percentages, volumes, and surface areas. I did well on finding the surface area of different shapes. I found this chapters one of the easiest ones that we did so far. Also I did well on drawing nest and making 3D shapes on graph paper. The tests for Prisms and Cylinders weren’t even hard, I’d only get a couple wrong. Also I did pretty good on finding the volume of all those shapes. I really got how to do it, It easy to understand.

I wasn’t very good at remembering all the formulas for all the different shapes. Also I wasn’t very good with finding percentages and converting fractions. I often got confused. I kind of struggled on finding the volume of a shape inside of a shape, but after a while of doing it I kind of get it now.

For term 3 I’m going to try to get better in math by, doing more blogs, asking questions and finishing my homework. I want to be ready for grade 9 because I don’t want to fail. Try to finish all the questions that Mr.Harbeck assigns me, because they will help me understand it more and it will be easier for me on tests. I will also try not to rush on test, so I`ll read everything it is asking me to do. Also, I would like to do better on my blogs by doing more then Mr.Harbeck asked me to do, and try to comment on everyithng that is published. So that’s how I would want to get better.

I will post my Audioboo when I get it to work on my computer.