section 5.5
DESCRIPTION
TRANSCRIPT
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?