Lesson 5-2 Pages 205-209

Rational Numbers

Lesson Check 5-1

What you will learn!1. How to write rational

numbers as fractions.

2. How to identify and classify rational numbers.

Rational numberRational number

What you really need to know!

A number that can be written as a fraction is a rational number. Mixed numbers, integers, and many decimals can be written as fractions.

What you really need to know!

Other decimals such a = 3.14592654… are infinite and nonrepeating. They are called irrational numbers.

Rational Numbers

1.8

0.7

5

24

3

2

-3.222…

Integers

-5 -12

What you really need to know!

Whole Numbers

6 150123

Natural Numbers

Natural Numbers

Whole Numbers

Integers Rational Numbers

5

5 5 5 500

0

0

-7

-7 -7

4.5

4.5

3/4

3/4

Example 1:

fraction. a as 8

34- Write

-(8 • 4 + 3)

8

35

fraction. a as 10 WriteExample 2:

1

10

Example 3:

Write each decimal as a fraction or mixed number in simplest form.

0.26100

26

50

13

Example 4:

Write each decimal as a fraction or mixed number in simplest form.

2.8751000

8752

8

72

Example 5:

Write 0.39 as a fraction in simplest from.

n = 0.39393939…

100n = 39.393939…

Example 5:

- n = 0.393939…100n = 39.393939…

99n = 3999 99

99

39n

33

13n

Example 6:

Identify all sets to which each number belongs.

a. 15Natural, Whole, integer, and rational

8

1 b. Rational number

Example 6:

Identify all sets to which each number belongs.

c. 0.3030303030…

Rational number

Page 207

Guided Practice

#’s 3-11

Pages 205-207 with someone at home and study

examples!

Read:

Homework: Pages 208-209

#’s 12-48 even

#’s 52-75

Lesson Check 5-2

Page

733

Lesson 5-2

Lesson Check 5-2