# What does it mean to say… “60% of the cars in the parking lot are blue”?

## Presentation on theme: "What does it mean to say… “60% of the cars in the parking lot are blue”?"— Presentation transcript:

What does it mean to say… “60% of the cars in the parking lot are blue”?

In this lesson you will learn to define percents by using ratios.

Ratios show how two (or more) quantities are related. Let’s Review Part-to-total ratio: 1 pink sweater for every 5 total sweaters

The ratio of pink sweaters to total sweaters is… 1 to 51:5 5 1

Simplifying ratios 4 : 20 2 : 10 1 : 5 20 4 10 2 5 1

Let’s Review A Common Mistake Confusing 60% and 60 60% of the cars ≠ 60 of the cars

Let’s Review Core Lesson 60% of the cars in the parking lot are blue. 60% = 60 percent for every10060% = 60 A percent is a part-to-total ratio where the second number is always 100.

Let’s Review Core Lesson 60% of the cars in the parking lot are blue. 60 for every 100 total cars are blue. 60 out of 100 total cars are blue. The ratio of blue cars to total cars is 60:100. The ratio of blue cars to total cars is 100 60 100 = total number of cars 60 = part that are blue

Let’s Review Core Lesson 60% of the cars in the parking lot are blue. 60 out of 100 total cars are blue. 100 60 _2 _10 50 30 = 5 3 = 30 out of 50 total cars are blue. 3 out of 5 total cars are blue.

In this lesson you have learned to define percents by using ratios.

Let’s Review Guided Practice Which is NOT equivalent to 30% ?  30 out of 100  30:100  10 out of 30  3 for every 10

Let’s Review Extension Activities 60% of the cars in the parking lot are blue. Write a part-to-part ratio that describes this situation. What does the second number in your ratio mean?

Let’s Review Extension Activities Write 59% as a ratio in three different ways.

Let’s Review Quick Quiz Which is NOT equivalent to 25% ? Write 7% as a ratio in three different ways.  25:100  100 for every 25  5 out of 20 d. 4 1

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