Formulas Of Circles

Formulas Of Circle

C=πd this is used to measure the circumference of a circle 
C=2πr twice the radius is the diameter 
A=πr2 this is used to measure the area
d=2r this is used to measure the diameter

Review: Mean, Median, Mode, Range, Outlier,

Mean:
-add up all the values , divide by how many numbers there are
 Median:
-the middle number in a data set
Mode:
-the value that shows up the most
Range:
-the positive difference between largest and smallest values
Outlier:
-values that are too big or smallest
values

Review: Divisibility Rules

The Divisibility Rules: 

 0 - end in zero

1 - all numbers

 2 - all even numbers

 3 - sum of the digits is 3 

4 - divisible by 2 twice 

 5- ends in 0 or 5

6- divisible by 2 and 3 

7- nothing 

8- divisible by 2 thrice 

9- sum of the digits is 9

10- ends in 0 

 

Review: Quadrants

(+,+) quadrant l
(-,+) quadrant II
(-,-) quadrant III
(+,-) quadrant IV

Review: Transformations

Translation - slide slon a straight line
Rotation - turn  about a fixed point 
Reflection - mirror image 

What's a Constant?

A Constant is......

A number that does not change and it increases or decreases the value of an expression

A Question we got in Math class and its Answer

Question. A group of students are talking, 2 friends leave the group. Write an expression for the number of students in the group after the 2 leave?

Answer. S- 2

How I got it. well since I don't know how many students are in the group its unknown so I put S for students the - 2

What Is An Expression ?

An Expression- is any single number or variable combination of operation ( -, +, x, ./.) involving a number.

What is a Variable?

A Variable- is a letter that represents an unknown number. eg. x,n,s

What is a number Coefficent?

A Number Coefficent- is a number that multiplies the variables

Divisiblility Rules.

1. All whole numbers are divisible by 1.
2. All whole numbers that end in 0,2,4,6,8 is divisible by 2.
3. The sum of the digits is divisible by 3,
4. All whole numbers that are divided by 2 twice and the sum is a whole number it is divisible 4.
5. All whole number that end in 0,5 are divisible 5
6. If the whole number is divisible by 2 and 3 is divisible by 6.
7. There is NO divisibility rule for 7.
8. All whole numbers that you divided thrice times (three times) and equals a whole number it is divisible by 8.
9. The sum of the digits is divisible by 9.
10. All whole numbers that end with 0 is divisible by 10.

Textbook Page 214

In Math today I was tol to do the blog and in th textbook number 8.

The question was:
8) Write each addition statement shown by the diagrams. Then add. Write you answer in lowest term.

the diagram showed 2/4 + 1/4=3/4
Now make it in the lowest term theres is known because thats as low as you can go!

the diagram showed 5/8 + 1/8= 6/8
the lowest term is: 3/4 you divide by 2

the diagram showed 4/10+3/10=7/10
the lowest term is: there is known because it won't equal a whole number!

thats the answer to number 8 it te textbook.

Chapter Review

I'm going to do number 10 in my math booklet at school.

Heres it is:

p.s the orange is the helpers for the answer the black is the answers

What We Did In Math Today

Today in math we learned about fractions, decimals, and last but not least percents.

a fraction is....
a whole number
____________ over a
whole number

eg.

a Demicals







anything



_________over



1

a Percent is .....

anything

_________over

100

eguivalent fractions:

eg.

A terminating decimal means the numbers stop .

A repeating decimal means the decimal is repeatung forever.

Remember to do in your homework booklet pages 42-45 don't forget!

Order of Operation

Here is a step by step guide on how to solve a BEDMAS question.







The example is be:4x3+12÷2=18







First, you check for brackets. There are none.







Then you check for exponents. There are none.







Now, check for multiplication and division. There are some.







You do multiplication first because it shows up first when you go left to right.







Now you have this:12+12÷2=18







Now you do division because there are no brackets, exponents or multiplication.



It should look like this:12+6=18







There are no brackets, exponents, multiplication or division.



All there's left to do is either add or subtract.



12+6=18











There's no subtraction sign, but there is an addition sign so you add.



Your answer should be 18. 18=18







click http://www.onlinemathlearning.com/bedmas.html to help more with this







this is what it should look like

and this vidoe might help you if you are still have some problems

http://youtu.be/QCzz09BvcCY