0-12
0-12
Finding
Findinga aCommon
CommonDenominator
Denominator
Lesson Presentation
Holt
Holt
Algebra
Algebra
11
Finding a Common Denominator
0-12
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Bell Quiz 0-10 through 0-11
24
Write
in simplest form.
36
3 pts
1.
3 pts
2. Write 0.28 as a percent
3 pts
3.
Write 0.22 as a fraction in simplest form.
1 pt for coming
☺
Holt Algebra 1
10 pts
possible
0-12
Finding a Common Denominator
Questions on 0-5, 1-2
Holt Algebra 1
0-12
Finding a Common Denominator
Objectives
Find common denominators and the LCD.
Write equivalent fractions by using the LCD.
Holt Algebra 1
0-12
Finding a Common Denominator
•When working with fractions, you
must often rewrite fractions as
equivalent fractions with the same
denominator, the common
denominator of the fractions.
•The easiest way to find a common
denominator of two or more fractions
is to multiply the denominators.
Holt Algebra 1
0-12
Finding a Common Denominator
Example 1A: Finding a Common Denominator
1
4
Find a common denominator of 6 and 9 .
Holt Algebra 1
0-12
Finding a Common Denominator
Check It Out! Example 1a: Finding a Common
Denominator
1
2
Find a common denominator of 3 and 4 .
Holt Algebra 1
0-12
Finding a Common Denominator
Least Common Denominator, or LCD, of
two or more fractions is the least number
that is a common denominator of the
fractions.
The LCD is the LCM of the denominators.
Holt Algebra 1
0-12
Finding a Common Denominator
Example 2: Finding the LCD
Find the LCD of each pair of fractions.
2A: 16 and 94
Find the LCM by listing the multiples.
3
1
2B: 14 and 4
Find the LCM using prime factorization.
Holt Algebra 1
0-12
Finding a Common Denominator
Example 3A: Writing Equivalent Factions with the
LCD
1
4
Find the LCD of 6 and 9 . Then
rewrite each fraction as an
equivalent fraction with the LCD.
Holt Algebra 1
0-12
Finding a Common Denominator
Check It Out! Example 3a: Writing Equivalent
Fractions with the LCD
1
3
Find the LCD of 14 and 4 . Then rewrite each
fraction as an equivalent fraction with the
LCD.
Holt Algebra 1
0-12
Finding a Common Denominator
HOMEWORK
• Section 0-12 (Pg Z29)
4, 5, 11-21 all
Holt Algebra 1