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Preview. Warm Up. California Standards. Lesson Presentation. Warm Up Solve. 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%. California Standards.

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Warm Up

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Warm up

Preview

Warm Up

California Standards

Lesson Presentation


Warm up

Warm Up

Solve.

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%


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California

Standards

Number Sense (NS1.4) - Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.


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Objective: You will learn how to (YWLHT) solve problems involving percent.


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Vocabulary

Regular price –the amount something costs before a discount (Sale Price + Discount = Regular Price)

Discount –the amount that is taken off, saved, or that you do not have to pay (Regular Price – Sale Price = Discount)

Sale price –the amount something costs after a discount is taken off (Regular Price - Discount = Sale Price )


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Example 1: Finding the sale price using proportions.

The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the sale price?

Step 1: Find the amount of the sale price.

Think: 80% of $42.99 is what number?

80

100

n

42.99

=

Write a proportion.

80 • 42.99= 100 • n

Set the cross products equal.

3439.2= 100n

3439.2

100

= 100n

100

Divide each side by 100.

34.392= n

Round to the nearest cent.

The amount of the sales price is $34.39.


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Example 1: Finding the sale price using decimals.

The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the sale price?


Warm up

Example 2: Finding the discount using proportions

The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the discount?

Step 1: Find the amount of the discount.

Think: 20% of $42.99 is what number?

20

100

n

42.99

=

Write a proportion.

20 • 42.99= 100 • n

Set the cross products equal.

859.8= 100n

859.8

100

= 100n

100

Divide each side by 100.

8.598= n

Round to the nearest cent.

The amount of the discount is $8.60.


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Example 2: Finding the discount using decimals

The regular price of a bicycle helmet is $42.99. It is on sale for 20% off. What is the discount?


Warm up

Check It Out! Example 3

The regular price of a computer game is $49.88. It is on sale for 15% off. What is the sale price?


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Check It Out! Example 3

The regular price of a computer game is $49.88. It is on sale for 15% off. What is the discount?


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Home Learning

On-Line Tutoring


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Example 4


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Example 5


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Example 6


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Example 7


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Example 8


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Example 9


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Home Learning


Warm up

California

Standards

Number Sense (NS1.4) - Calculate given percentages of quantities and solve problems involving discounts at sales, interest earned, and tips.


Warm up

Objective: You will learn how to (YWLHT) solve problems involving percent.


Warm up

Sales Tax

Sales Tax –the amount that is ADDED to what you pay (Price + Sales Tax = Total/Final Cost)


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Example 10


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Example 11


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Example 12


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Example 13


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Example 14


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Example 15


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Example 16


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Home Learning


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Lesson 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 and sale price?

5. A backpack that sells for $42 is on sale for 25% off. Find the sale price.

20%

80%

Discount $30 Sale Price $90

90%

$31.50


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