Mean - Add up all the values then you divide by how many values there are.


Median - The middle number in a set of ordered values, might be the mean of 2 middle values.

Mode - The value that shows up the most.


Range - Positive differences between the largest and smallest values.


Outlier - Values that are too big or too small compared to the other values.


Make sure you know these definitions! They will be on the exam! 

What is a variable? 
A variable is an unknown number.


What is an expression?
An expression contains variables, operations, and numbers in any combination.

Integers

Negative numbers: represent values below zero and positive numbers represent values about zero


Example: Above and below ground or sea level
1 + (-2) = (-1) This is an addition statement.
3 - (-1) = 4 This is a subtraction statement.


Opposite integers: have the same numeral but different sign. Example: 3 and (-3)

Divisibility Rules

Divisibility Rules

(+,+)   Quadrant l
(-,+)   Quadrant ll 
(-,-)  Quadrant lll
(+,-)   Quadrant lV

Make sure you know each quadrant sign for the exam! 

Transformations

Transformations:
Translations - Slide along a straight line.
Rotation: Turn about a fixed point.
Reflection: Mirror image.
   Make sure you know how to do and describe each of them.

I LOVE CHEESE

Hi Everyone! CHEEESEE!

Adding Mixed Numbers.

What is a mixed number? A number made up of a whole number and a fraction such as:

Try this:

Step 1) Deal with fractions. Already has common denominator.

Step 2) Deal with whole numbers.

Step 3) Combine whole numbers and fractions.

February 9, 2012: BEDMAS Question.

Question:

Is there any brackets? No.

Is there any exponents? Yes, go from left to right.

Exponent: 8x8=64.

Then you rewrite the rest.

Now you do the other exponent.

Exponent: 2x2=4

After that, you do the division.

That equals:

Expression Word Problem:

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 friends leave!

My answer to this word problem is: S-2 or it can also be G-2. Do you want to know why?

Explanation: It says on the question that there are a group of students so we don't know how many there are. Therefore we use a Variable to represent an unknown number.

We can use S - Students or G - Group as the variable.

The next thing it says on the word problem is that are 2 friends that left the group! That's why my answer is S-2 or G-2.

Value, Constant, Numerical Coefficient.

Value - A known or calculated amount.

Constant - A number that does not change. It increases or decreases the value of an expression.

Numerical coefficient - A number that multiples the variable.

Variable and Expression.

Variable - A letter that represents an unknown number.

• It also means something we don't know, or haven't figured out yet.

Example: x, a, or n.

Expression: Any single number or variable or combination of operations. Examples of operations are ( -, +. x) Involving numbers and variables.

Example: 5, n, 8t, x+1, 2y -7.

Numerator and Denominator

What is a numerator and a denominator?

- A numerator is the top number of a fraction that tells us how many parts of the whole we have or are dealing with.

Example:

- A denominator is the bottom number of a fraction that tells us how many equal parts of the whole is divided into.

Example:

Prime Factors

What is a prime factor?

1) Prime factor is a number with only two factors. 1 and itself.

2) Prime factor goes into a number with no remainder or a decimal.

Try this!

1) Find all prime factors of 18.

Another way to find the prime factors of 18 or any other number is called a Factor Tree!

Textbook Question #7

This question can be found on page 214.


Number 7) Write each addition statement shown by the diagrams. Then add. Write your answer in lowest terms!

Chapter Four Review Test:

This is one question on the Chapter Four Review Test: Page 146.

4. Use a ratio table to show your answer.
d) 75 % of 124



- The answer for this question would be 93.

Remember! What you do to one side, you have to do to the other side!

Order Of Operations

How to answer today's Order Of Operation Question!

1. The first thing I did was look for Brackets.
As you can see there aren't any. So I went to Exponents. No exponents either.

So I did the Multiplication first.

2. After that I looked for the Division


3. I did the Addition after that.


4. 12 + 6 gave me 18 the answer!

Here is a video that may also help you with Order Of Operations!




Order Of Operation! Check it out!