Lesson 5-8 Pages 227-231

Comparing and Ordering Rational

NumbersLesson Check 5-7

What you will learn!

How to compare and order fractions, decimals,

and percents.

Common denominatorCommon denominator

Least common denominator (LCD)Least common denominator (LCD)

Rational numbersRational numbers

What you really need to know!

To compare fractions, rewrite them so they have the same denominator. The least common denominator (LCD) of two fractions is the LCM of their denominators.

What you really need to know!

Another way to compare fractions is to express them as decimals. Then compare the decimals.

Rational Numbers

5.2

0.8

3

25

2

1

-1.444…

Integers

-6 -10

What you really need to know!

Whole Numbers

8 131

Find the LCD:

9

7

6

5and

18

15

3

3

6

5

18

14

2

2

9

7

Find the LCD:

7

1

4

3and

28

21

7

7

4

3

28

4

4

4

7

1

Example 1:

Joe and his younger brother both had a math test last Friday. Joe scored 48 points out of 60 and his brother scored 55 points out of 75. Who got the better score?

Example 1:

%808.0604860

48

%7337.0755575

55

Joe had the better score.

Example 2:

According to the Pet Food Manufacturer’s Association, 11 out of 25 people own large dogs and 13 out of 50 own medium dogs. Do more people own large or medium dogs?

Example 2:

%4450

22

225

211

25

11

%2650

13

150

113

50

13

Large!

Example 3:

greatest. least to from

72% and 0.6, ,10

7Order

7.010710

7

6.06.0 72.010072%72

72% ,10

7 0.6,

0

0

Example 4:

Find the number that is rational.

AA 0.12345…0.12345…BB 0.123123…0.123123…CC DD 0.10203…0.10203…

AA 0.12345…0.12345…BB 0.123123…0.123123…CC DD 0.10203…0.10203…

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

Page 229

Guided Practice

#’s 3-12

Pages 227-229 with someone at home and study

examples!

Read:

Homework: Page 230-231

#’s 14-50 even

#’s 54, 55, 58-64

Lesson Check Ch 5

Page

576

Lesson 5-8

Lesson Check Ch 5

Study Guide and Review

Pages

232-234

#’s 1-68(Odd answers in back of book)

Prepare for Test!

Page

235

#’s 1-20 Lesson Check Ch 5Practice Test Answers

Lesson Check Ch 5 V2

Practice Test Answers

Prepare for Test!

Pages

236-237

#’s 1-17