Holt CA Course 1 6-6 Percent of Change Warm Up Warm Up California Standards California Standards...
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Transcript of Holt CA Course 1 6-6 Percent of Change Warm Up Warm Up California Standards California Standards...
Holt CA Course 1
6-6 Percent of Change
Warm UpWarm Up
California StandardsCalifornia Standards
Lesson PresentationLesson Presentation
PreviewPreview
Holt CA Course 1
6-6 Percent of Change
Warm UpSolve.
1. 10% of what number is 6?
2. What percent of 20 is 8?
3. What is 80% of 60?
4. 50 is what percent of 200?
60
40%
48
25%
Holt CA Course 1
6-6 Percent of Change
Number Sense (NS1.4) - Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.
California Standards
Holt CA Course 1
6-6 Percent of Change
Objective:Objective: You will learn You will learn how to (YWLHT) solve how to (YWLHT) solve problems involving percent.problems involving percent.
Holt CA Course 1
6-6 Percent of Change
Vocabulary
Sale priceSale price – the amount something costs afterafter a
discount is taken off (Regular Price - (Regular Price -
Discount = Sale Price )Discount = Sale Price )
Discount –Discount – the amount that is taken off, saved, or that
you do not have to pay (Regular Price – Sale Price (Regular Price – Sale Price
= Discount)= Discount)
Regular price –Regular price – the amount something costs beforebefore a
discount (Sale Price + Discount = Regular (Sale Price + Discount = Regular
Price)Price)
Holt CA Course 1
6-6 Percent of Change
The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the sale price?
Example 1: Finding the sale price using proportions.
Step 1: Find the amount of the sale price.
The amount of the sales price is $34.39.
Think: 80% of $42.99 is what Think: 80% of $42.99 is what number?number?
Write a Write a proportion.proportion.
80100
= n42.99
3439.2 = 100n
3439.2100
= 100n 100
80 • 42.99 = 100 • nSet the cross Set the cross products products equal.equal.
Divide each Divide each side by 100.side by 100.
34.392 = n Round to the nearest cent.Round to the nearest cent.
Holt CA Course 1
6-6 Percent of Change
The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the sale price?
Example 1: Finding the sale price using decimals.
Holt CA Course 1
6-6 Percent of Change
The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the discount?
Example 2: Finding the discount using proportions
Step 1: Find the amount of the discount.
The amount of the discount is $8.60.
Think: 20% of $42.99 is what Think: 20% of $42.99 is what number?number?
Write a Write a proportion.proportion.
20100
= n42.99
859.8 = 100n
859.8100
= 100n 100
20 • 42.99 = 100 • n Set the cross Set the cross products products equal.equal.
Divide each Divide each side by 100.side by 100.
8.598 = n Round to the nearest cent.Round to the nearest cent.
Holt CA Course 1
6-6 Percent of Change
The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the discount?
Example 2: Finding the discount using decimals
Holt CA Course 1
6-6 Percent of Change
The regular price of a computer game is $49.88. It is on sale for 15% off. What is the sale price?
Check It Out! Example 3
Holt CA Course 1
6-6 Percent of Change
The regular price of a computer game is $49.88. It is on sale for 15% off. What is the discount?
Check It Out! Example 3
Holt CA Course 1
6-6 Percent of Change
Home Home
LearningLearning
On-Line On-Line TutoringTutoring
Holt CA Course 1
6-6 Percent of ChangeExample 4
Holt CA Course 1
6-6 Percent of ChangeExample 5
Holt CA Course 1
6-6 Percent of ChangeExample 6
Holt CA Course 1
6-6 Percent of ChangeExample 7
Holt CA Course 1
6-6 Percent of ChangeExample 8
Holt CA Course 1
6-6 Percent of ChangeExample 9
Holt CA Course 1
6-6 Percent of Change
Home Home
LearningLearning
Holt CA Course 1
6-6 Percent of Change
Number Sense (NS1.4) - Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.
California Standards
Holt CA Course 1
6-6 Percent of Change
Objective:Objective: You will learn You will learn how to (YWLHT) solve how to (YWLHT) solve problems involving percent.problems involving percent.
Holt CA Course 1
6-6 Percent of Change
Sales TaxSales Tax
Sales Tax –Sales Tax – the amount that is ADDEDADDED to what you pay
(Price + Sales Tax = Total/Final (Price + Sales Tax = Total/Final
Cost)Cost)
Holt CA Course 1
6-6 Percent of ChangeExample 10
Holt CA Course 1
6-6 Percent of ChangeExample 11
Holt CA Course 1
6-6 Percent of ChangeExample 12
Holt CA Course 1
6-6 Percent of ChangeExample 13
Holt CA Course 1
6-6 Percent of ChangeExample 14
Holt CA Course 1
6-6 Percent of ChangeExample 15
Holt CA Course 1
6-6 Percent of ChangeExample 16
Holt CA Course 1
6-6 Percent of Change
Home Home
LearningLearning
Holt CA Course 1
6-6 Percent of ChangeLesson Quiz
Find each percent of change.1. 10 is increased to 12.
2. 25 is increased to 45.
3. 10 is decreased to 1.
4. The regular price of a coat is $120. It is on sale for 25% off. What is the discount andand sale
price?
5. A backpack that sells for $42 is on sale for 25% off. Find the sale price.
80%
20%
90% Discount $30 Sale Price $90
$31.50
