How are fractions used and applied in the larger world?

Learning Target:Students will learn how to compare

and order fractions.

You can use models to compare fractions but we are going to focus

today on finding a common denominator as a way to compare and

order fractions.

To find a common denominator you can multiply the two denominators

together.

EXAMPLE 1 Comparing Fractions Using the LCD

Compare 5

6.7

9and

You can also find the LCM of the two denominators which is called the Least

Common Denominator (LCD).

EXAMPLE 1 Comparing Fractions Using the LCD

Compare 5

6.7

9and

EXAMPLE 1 Comparing Fractions Using the LCD

Compare

STEP 1

5

6.7

9and

EXAMPLE 1 Comparing Fractions Using the LCD

Compare

STEP 1 Find the LCD: Because the LCM of 6 and 9 is 18, the LCD is 18.

5

6.7

9and

EXAMPLE 1 Comparing Fractions Using the LCD

STEP 2

Compare

STEP 1 Find the LCD: Because the LCM of 6 and 9 is 18, the LCD is 18.

5

6.7

9and

EXAMPLE 1 Comparing Fractions Using the LCD

STEP 2 Use the LCD to write equivalent fractions.

Compare

STEP 1 Find the LCD: Because the LCM of 6 and 9 is 18, the LCD is 18.

5

6.7

9and

EXAMPLE 1 Comparing Fractions Using the LCD

STEP 2 Use the LCD to write equivalent fractions.

Compare

STEP 1 Find the LCD: Because the LCM of 6 and 9 is 18, the LCD is 18.

5

6=

5

6.7

9and

Remember whatever you multiply the numerator by you must do the same to the denominator to keep the fraction

equivalent.

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

STEP 1 :

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

STEP 1 : Find the LCD : Because the LCM of 7 and 5 is 35, the LCD is 35.

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

STEP 1 : Find the LCD : Because the LCM of 7 and 5 is 35, the LCD is 35.

STEP 2 :

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

STEP 1 : Find the LCD : Because the LCM of 7 and 5 is 35, the LCD is 35.

STEP 2 :

Use the LCD to write equivalent fractions.

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

?25

STEP 1 : Find the LCD : Because the LCM of 7 and 5 is 35, the LCD is 35.

STEP 2 :

Use the LCD to write equivalent fractions.

1. Copy and complete the statement with <, > or = :

GUIDED PRACTICE for Example 1, 2 and 3

37

=

http://www.mathplayground.com/howto_comparefractions.html

Video on comparing and ordering fractions.

Can you compare and order fractions using finding common denominators?