Lesson 4.9 - Comparing And Ordering Rational Numbers
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Five-Minute Check (over Lesson 4–8) Main Idea and Vocabulary Example 1:Compare Rational Numbers Example 2:Compare Rational Numbers Example 3:Real-World Example Concept Summary: Fractions-Decimals-Percents Example 4:Test Example
• Compare and order fractions, decimals, and percents.
• rational numbers • common denominator • least common denominator (LCD)
Compare Rational Numbers
Graph each rational number on a number line. Mark off equal size increment of
between –4 and –3.
Answer: The number line shows that
.
A. > B. < 0%
A B C
0% C
A
0%
B
C. =
1. 2. 3.
Compare Rational Numbers
Use Chinese Math to find the LCM of 12 and 16. The LCM is 48. The LCD of 12 and 16 is 48.
A. > B. <
0%
A B C
0% C
A
0%
B
C. =
1. 2. 3.
DOGS According to the Pet Food Manufacturer’s Association, 11 out of 25 people own large dogs and 13 out of 50 people own medium dogs. Do more people own large or medium dogs?
Answer: A greater fraction of people own large dogs that own medium dogs.
SEASONS A survey showed that 21 out of 50 people stated that summer is their favorite season and 13 out of 25 people stated that fall is their favorite season. Do more people prefer summer or fall? A. Summer B. Fall 1. 2.
0% B
A
0%
A B
Four frozen dinners had the following amounts of vegetables:
0.6, 72%, and
Which list shows
the numbers in order from least to greatest?
Read the Item Write each amount as a decimal. Then compare. Solve the Item
Answer: So, the answer is C.
The proportion of male students in four classes are as follows:
Which list shows
the numbers in order from least to greatest?
A B C D
D
0% 0% 0% 0% C
D.
1. 2. 3. 4.
B
C.
B.
A
A.
End of the Lesson
Homework – Pg. 218-219, # 8-39 all
Five-Minute Check (over Lesson 4–8) Image Bank Math Tools
Percents Prime Factorization
(over Lesson 4-8)
Find the LCM of 4 and 12. C. 12
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 3 and 13. D. 39
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 12 and 15. A. 60
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 4, 6, and 8. C. 24
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 42 × 2 and 22 × 4. B. 32
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 54 and 90. C. 270
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
• Compare and order fractions, decimals, and percents.
• rational numbers • common denominator • least common denominator (LCD)
Compare Rational Numbers
Graph each rational number on a number line. Mark off equal size increment of
between –4 and –3.
Answer: The number line shows that
.
A. > B. < 0%
A B C
0% C
A
0%
B
C. =
1. 2. 3.
Compare Rational Numbers
Use Chinese Math to find the LCM of 12 and 16. The LCM is 48. The LCD of 12 and 16 is 48.
A. > B. <
0%
A B C
0% C
A
0%
B
C. =
1. 2. 3.
DOGS According to the Pet Food Manufacturer’s Association, 11 out of 25 people own large dogs and 13 out of 50 people own medium dogs. Do more people own large or medium dogs?
Answer: A greater fraction of people own large dogs that own medium dogs.
SEASONS A survey showed that 21 out of 50 people stated that summer is their favorite season and 13 out of 25 people stated that fall is their favorite season. Do more people prefer summer or fall? A. Summer B. Fall 1. 2.
0% B
A
0%
A B
Four frozen dinners had the following amounts of vegetables:
0.6, 72%, and
Which list shows
the numbers in order from least to greatest?
Read the Item Write each amount as a decimal. Then compare. Solve the Item
Answer: So, the answer is C.
The proportion of male students in four classes are as follows:
Which list shows
the numbers in order from least to greatest?
A B C D
D
0% 0% 0% 0% C
D.
1. 2. 3. 4.
B
C.
B.
A
A.
End of the Lesson
Homework – Pg. 218-219, # 8-39 all
Five-Minute Check (over Lesson 4–8) Image Bank Math Tools
Percents Prime Factorization
(over Lesson 4-8)
Find the LCM of 4 and 12. C. 12
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 3 and 13. D. 39
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 12 and 15. A. 60
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 4, 6, and 8. C. 24
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 42 × 2 and 22 × 4. B. 32
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-8)
Find the LCM of 54 and 90. C. 270
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
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