MATH SHARING IDEAS: September 2012

Saturday, September 22, 2012

8th GRADE: RELATIONS AND FUNCTIONS

Lesson 2-3B : FUNCTIONS

A Function is a relation in which each member of the domain (input value) is paired with exactly one member of the range (output value). Functions are often written as Equations, for example: F(x) = 25x. Where F(x) is where the input will be entered and 25x is where the output will come out. Check the image below

Check this link for Vocabulary Review on Lesson 2-3

When working with functions we can create a Function Table.

Tutorial : Find a Function Value

Tutorial: Make a Function Table

Tutorial: Real Life Problem involving Function Tables

Tutorial: Real Life Problem

Also check the Video below:

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CHECK YOUR KNOWLEDGE

Sunday, September 16, 2012

8th GRADE: ANALYZE & TRANSLATE TABLES AND GRAPHS

8th Grade check Lessons 2-2B, 2-2C, 2-2D

2-2B: ANALYZE TABLE

Helpful vocabulary

Tutorial: Use a table to analyze Sequence

Tutorial: Real Life Problem using table to analyze sequence.

CHECK YOUR KNOWLEDGE IN ANALYZING TABLES

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2-2 C: ANALYZE GRAPHS

Helpful Vocabulary word

Tutorial: Translate Graphs into an Expression

CHECK YOUR KNOWLEDGE IN ANALYZING GRAPHS

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2-2D: TRANSLATE TABLES AND GRAPHS INTO EXPRESSIONS

Helpful Vocabulary

Tutorial: Translate Tables into an Equation

Tutorial: Translate Table into an Equation

Tutorial: Translate Graphs into an Equation

Tutorial: Translate Graph into an Equation

Tutorial: Real life problem involving Tables and Graphs

CHECK YOUR KNOWLEDGE IN TRANSLATING GRAPHS AND TABLES TO EXPRESSIONS

8th GRADE: ORDERED PAIRS & RELATIONS

Order pairs and Relations Definition and example.

8th Grade check Lesson 2-1C.

Vocabulary Card

Tutorial: Name the Ordered Pair

Tutorial: Graph an Ordered Pair

Tutorial: Graph an Ordered Pair

Tutorial: Relation as Table and Graph

Tutorial: Real Life Problem

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CHECK YOUR KNOWLEDGE

Saturday, September 15, 2012

8th GRADE VARIABLES AND EXPRESSIONS

8TH grade Lesson 2-1B to review Variables , Expressions and Algebraic Expressions

Look at some examples below:

Also check this Algebra Basic Definitions.

This tutorial shows how to Translate Phrases into Algebraic Expressions

Check How to evaluate expressions

This one also shows how to evaluate an expression using The Order of Operation

Finally check this Real Life problem

Now check this Video------->

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Now check your understanding HERE

Sunday, September 9, 2012

7th & 8th GRADE : INTEREST

8th Grade check Lesson 1-3B

7th Grade check Lesson 6-3E

Formula:

P= Is the principal of Money

Interest is the amount of money paid or earn for the use of money.

I= Is the Interest
P= Is the Money
r= Is the percent rate
t= Is the time

Check this Tutorial to see how simple interest is solved

Click here to see a real life problem involving Simple Interest

This tutorial will show you when "time" is given in months and not in years.

You can also check this video

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Compound Interest is paid on the initial principal and on the interest gained.

Check this Tutorial --->

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SEE IF YOU UNDERSTOOD EVERYTHING ABOUT INTEREST

Saturday, September 8, 2012

7th & 8th GRADE : DISCOUNT AND MARK UP

8th grade Lesson 1-3A

7th grade Lesson 6-3D

DISCOUNT

Important Facts:

-Discount is the amount by which a regular price is reduced

-You can find the sales price of an item by subtracting the discount from the original price.

-Check how to find the sales price

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MARKUP:

REMEMBER....

-Markup is when an item is sold at a higher amount than it was originally bought.

-You have an item which you pay $25. You sell the item for $30. The increased of the amount is called mark up.

-Check how to find Markup

Look at this tutorials

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CHECK YOUR KNOWLEDGE

7th & 8th GRADE: SALES TAX AND TIPS

7th grade Lesson 6-3C

8th grade Lesson 1-3A

Important Points:

-Sales tax is an additional amount of money charged to items that people buy.

-The total cost of an item is the regular price plus (+) the sales taxes.

-Tips and Gratuity is a small amount of money in return for a service.

-The total price is the regular price of the service plus (+) the tip.

-Here is how to find the tip

-Here is how to find Sales tax

-Check this real life problem shows tip and sales tax together.

check this video

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Check your Knowledge

7th & 8th GRADE: PERCENT OF CHANGE

Percent of Change is a ratio of a fraction that compares the change in quantity from the original amount to the new amount.
Follow these steps:
1. Subtract the two quantities and write the result on the numerator
2. Write the Original amount on the denominator.
3. Divide the fraction you just made: Numerator/Denominator. You will get a decimal.
4. Then convert the decimal to percent by multiplying by 100