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How to figure out percentages
1.
2. Students, you will need:
A calculator
Your math book
Your math notebook for note taking
A pencil
3. When you enter a store or supermarket, what
do you notice? (Wait for “Sales signs”)
Have you ever purchased something on sale?
(Wait for response)
What does it mean to buy something on sale?
(Wait for response)
If there is a sale, is the price tag the final price
the customer will pay? (Wait for response)
4. Stores often sell goods for a discounted price.
Typically, a store will discount an item by a percent of
the original price. In this lesson, we will look at an item
that originally costs $50 is being discounted by 25%. So
“25% off" refers to the rate of discount.
In this lesson you will calculate sale prices based on a
certain percentage given, like 25% off.
You will be able to master using a calculator to
calculate the new sales price.
5. Rate of discount or percentages are used all
around us on:
Sales on clothing, food or cars
Cooking, sewing or repairs
6. Yesterday we went over how to convert a
percentage to a decimal.
Let’s practice these 5 problems in class. Try
them on your own first:
1. 57%
2. 42%
3. 55%
4. 2%
5. 125%
7. Please come up to the board and
quickly write what you got for an
answer:
1. 57% (Jennifer)
2. 42% (Mike)
3. 55% (Jackson)
4. 2% (Bill)
5. 125% (Nicole)
8. Does everyone agree with these answers?
1. 57% = .57
2. 42% = .42
3. 55% = .55
4. 2% = .02
5. 125%= 1.25
Thank you for helping with the problems.
You all did a great job.
9. Here are a few vocabulary words to add to
your word bank:
Discount – decreasing of the price.
Discount Percentage – percent that the price is
decreased
Retail Price – price that the customer pays.
Customer: Someone who pays for goods and/or
services
Goods-is the product that you will purchase
10. Here are a few quick steps on how to
figure out a percentage.
Example:
How much will you save if the store has a sale on a
shirt that is 25% off of the purchase price?
11. Step 1: What are the variables in this problem:
Purchase price and the percent.
Purchase price?
$50.00
The percent off?
25%.
12. Let’s calculate the problem together: (Using a calculator)
Put 50.00 into your calculator
Hit the “X” sign
Then enter .25 or 25%
Hit “ = “ sign
$50.00 x 25% (or .25) = _______________
Calculate the amount and show me the answer.
13. The answer is????
$50.00 x 25% (or .25) = $12.50
$12.50
Did you get what I did? $12.50
14. What does this mean?
If you wanted to buy that shirt, you would
save $12.50.
15. Step 4: What will you have to pay for this shirt?
Take your purchase price and subtract what the
percentage answer was that you got in Step 3.
Purchase Price $50.00
25% off - $12.50
Answer??? _______
What did you get??????
16. Purchase Price $50.00
25% off - $12.50
Answer $37.50
$37.50
Is this what you got for your answer?
17. Here is another way to do it without your
calculators.
View the YouTube clip for more instruction.
http://www.youtube.com/watch?v=2rr-
IXInEVc
18. Practice some on your own:
Banana’s are on sale for 10% off. What is the
discount price and how much will you pay for
these banana’s?
A pair of shoes are on sale for 50% off. What is the
discount price and how much will you pay for
these shoes?
A basketball is on sale for 42% off. What is the
discount price and how much will you pay for the
basketball?
19. Stores often sell products for a discounted
price. Most stores will discount an item by a
percent off the original price. The discount is
usually given as a percent.
It is very important for you to be aware of how
to do this to make sure you are paying the
correct amount for your new shoes.
Will you be able to go to the store now and
calculate what you will pay for those new
shoes that are on sale?
20. Tomorrow we will be looking at the local
newspaper ads and figuring out if you have
enough money to buy items on sale.
Some of you will be the store owners and some
of you will be the consumer to purchase the
items.
Store owners, don’t forget your calculators.
Consumers, don’t forget your money.
21. Assign problems 1-15 (evens) on page 51.
For each problem, please tell me how much
you will save
And how much you will pay for the item.
For example, please label your answers like
this:
I will save $5.24 on the sale of apples.
I will pay $3.56 for my new shirt.
22. http://www.mathgoodies.com/lessons/perce
nt/sale_price.html
http://www.raymondgeddes.com/lesson-
plans/math-lesson-1/whats-on-sale-all.html
http://www.google.com/imghp?hl=en&tab=
wi