Unit 3 Day 4: Introduction to Percent

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Unit 3: The Decimal & Percent Connection

Day 4: Introduction to Percent

Where have you seen the % symbol?

50% OFF

Sale Sign

85%

Phone Battery

95%

Test Score

Today's Objectives

What does "Percent" Mean?

Let's break down the word!

Per

"for each"

Cent

"100"

So, "percent" literally means... for each 100 or out of 100.

The Main Idea of Percent

A percent is just a special type of fraction where the denominator is ALWAYS 100.

\(\frac{?}{100}\)

= ? %

Visualizing Percent

\(\frac{25}{100}\)

=

25%

I Do: Different Ways to See Percent

From a Visual

60 squares are shaded. So, \(\frac{60}{100} = 60\%\).

From a Fraction

\(\frac{45}{100}\)

Since the denominator is 100, the numerator is the percent. So, it's 45%.

We Do: Let's Try Together

Write as a percent:

\(\frac{18}{100}\)

Write as a fraction:

45%

You Do: Practice with a Partner

Solve these word problems.

Problem 1

A bag has 100 marbles. 8 of them are blue. What percent of the marbles are blue?

Problem 2

You get 92 questions correct on a 100-question test. What is your score as a percent?

Independent Practice

Try these problems on your own.

Green Level

50 out of 100 students have a pet. What percent is that?

Yellow Level

Write \(\frac{78}{100}\) as a percent.

Red Level

If you have 100 M&Ms and 22 of them are blue, what percent are NOT blue?

Exit Ticket

On a piece of paper, answer these two questions.

1. What percent of the grid is shaded?

2. Write 82% as a fraction.

Unit 3: The Decimal & Percent Connection

Day 4: Introduction to Percent - Notes

Today's Objectives

What does "Percent" Mean?

The word "percent" literally means .

A percent is a special fraction where the denominator is ALWAYS .

\(\frac{45}{100} = 45\%\)

I Do: Teacher Examples

From a Visual: Count the shaded squares.

\(\frac{60}{100}\) = %

From a Fraction: If a fraction is out of 100, the numerator is the percent.

\(\frac{45}{100}\) = %

We Do: Guided Practice

1. Write as a percent: \(\frac{18}{100}\) = %

2. Write as a fraction: \(45\%\) =

You Do: Partner Practice

1. A bag has 100 marbles. 8 of them are blue. What percent of the marbles are blue? %

2. You get 92 questions correct on a 100-question test. What is your score as a percent? %

Independent Practice

Green: 50 out of 100 students have a pet. What percent is that?

Yellow: Write \(\frac{78}{100}\) as a percent.

Red: If you have 100 M&Ms and 22 of them are blue, what percent are NOT blue?

Exit Ticket

1. What percent of the grid is shaded?

Answer: %

2. Write 82% as a fraction.