Math 8

Unit 5 Percent, Ratio and Rate

Lesson 54 Sales Tax and Discount

Focus

The FOCUS section introduces the main concept that will be covered in the lesson.

TEXT Page 256

Read/Work through the  Focus  section at the top of page 256 in  your textbook.

Investigate

Investigate an idea or problem, with a partner if possible.
The investigation provides the background for the ideas presented in the lesson.

TEXT Page 256

Read/Work through the  Investigate  section on Page 256 in your textbook.

You may not have a partner to work with.  
No worries!  
You can do this activity on your own.
Do your best to answer the questions, then watch the Video Tutorial for help or to check your answers.

NOTE!   The rates for these taxes change all the time.   Use the values given in the table at the top of Page 256 if you want to compare answers with mine.

Watch

Video Tutorial

Connect

Connect summarizes the math in the lesson.
A presentation of ideas connected to the lesson focus.

TEXT Page 257

Read/Work through the  Connect  section on Page 257 in your textbook.

There is a second section of notes after Example 1  (on page 257)

Examples

Examples will give you TOOLS for solving problems, and also show you that there may be different ways to approach a question.

Example 1

TEXT Page 257

Work through Example 1 on Page 257 in your textbook.

Watch

Video Tutorial

Example 2

TEXT Page 258

Work through Example 2 on Page 258 in your textbook.

Watch

Video Tutorial

Example 3

TEXT Page 259

Work through Example 3 on Page 259 in your textbook.

Watch

Video Tutorial

Practice Problems

Doing Practice Problems

Practice problems reinforce the math presented in this lesson.

•	Work through the practice problems for this lesson.
	These problems are for practice, you don’t need to hand them in!
	(your teacher may assign specific questions for you to complete)

•	Use the answers in the back of the book to CHECK YOUR WORK!

•	If you make a mistake, TRY TO FIX IT!

•	If you need help or want more information, view the video solutions provided.

•	If you still need more help,  CONTACT YOUR TEACHER!

Types of Practice Problems

Discuss the Ideas invites you to talk about the math.
If possible share your thoughts/ideas/answers with another person.
If you can help them understand, then you likely have good understanding yourself.

Check questions require basic understanding of the ideas of the  lesson.

Apply questions will require you to dig deeper for a solution.

Take It Further questions offer enrichment and extension.

Notes

The rates for the taxes used in many of these problems change all the time.   
Use the values given in the table at the top of Page 256 if you want to compare answers with mine.

Question 1,    a good discussion question, but , no... it makes no difference.
I didn’t make a video for this one.

Question 2,    money should ALWAYS be written as a decimal amount with 2 digits after the decimal place.
I didn’t make a video for this one.

Question 3,    this will depend on where you live.   
I didn’t make a video for this one.

Question 18,    sorry, no video here.   I will admit that I can’t follow the wording of the question!
Using the answers in the back, I can see that  1.14 × 87.72 = 100,   but I can’t really think how to explain what that is!
Would welcome any feedback or comments.

Video Solution Links

Check your work for every problem you do!
If you make a mistake,  try to fix it!
Use the video solutions for more information.
If a problem still doesn’t make sense, ASK YOUR TEACHER FOR HELP!

({{ ,  ,  , "Question 4", "Question 5"}, {"Question 6", "Question 7", "Question 8", "Question 9", "Question 10"}, {"Question 11", "Question 12", "Question 13", "Question 14", "Question 15"}, {"Question 16", "Question 17",  , "Question 19", "Question 20"}})