Lesson 4.7 - Percents And Decimals
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Five-Minute Check (over Lesson 4–6) Main Idea Example 1:Write Percents as Decimals Example 2:Write Percents as Decimals Example 3:Write Decimals as Percents Example 4:Write Decimals as Percents Concept Summary: Percent as a Decimal and Decimal as a Percent
• Write percents as decimals and decimals as percents.
Write Percents as Decimals Write 47.8% as a decimal. Write the percent as a fraction. Multiply by 10 to remove the decimal in the numerator. Simplify. Write the fraction as a decimal. Answer: 47.8% = 0.478
Write 83.2% as a decimal. B. 0.832
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
POPULATION According to the Administration on Aging, about
of the population of the United
States is 19 years of age or younger. Write as a decimal.
Remove the % symbol and divide by 100. Add leading zero. Answer:
AMUSEMENT PARKS A popular amusement park reports that
of its visitors will return at least
three times during the year. Write
as a
decimal. B. 0.171
1. 2. 3. 4.
0% D
0% C
0% B
A
0%
A B C D
Write Decimals as Percents Write 0.33 as a percent. 0.33 = 0.33 = 33%
Answer: 0.33 = 33%
Multiply by 100. Add the %.
Write 0.7 as a percent. C. 70%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
POPULATION In 1790, about 0.05 of the population of the United States lived in an urban setting. Write 0.05 as a percent. 0.05 = 0.05 = 5% Answer: 0.05 = 5%
Multiply by 100. Add the % symbol and drop the leading zeros.
POPULATION In 2000, the population of Illinois had increased by 0.086 from 1990. Write 0.086 as a percent. C. 8.6%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
Interactive Lab: Percents
End of the Lesson
Homework – Pg 208-209, # 9-34 all, 38-48 even
Five-Minute Check (over Lesson 4–6) Image Bank Math Tools
Percents Prime Factorization
(over Lesson 4-6)
A. 67%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
Write the ratio 32 per 100 as a percent. D. 32%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
A. 25%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
C. 85%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
Write 55% as a fraction in simplest form. A. B. C. 0% D
0%
A B C 0% D C
A
0%
B
D.
1. 2. 3. 4.
(over Lesson 4-6)
There are 200 people in the audience of a game show. Fifty are chosen to participate. What percent of the audience will be chosen to participate? A. 25%
0% D
A B C 0% D C
B
A
0%
1. 2. 3. 0% 4.
• Write percents as decimals and decimals as percents.
Write Percents as Decimals Write 47.8% as a decimal. Write the percent as a fraction. Multiply by 10 to remove the decimal in the numerator. Simplify. Write the fraction as a decimal. Answer: 47.8% = 0.478
Write 83.2% as a decimal. B. 0.832
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
POPULATION According to the Administration on Aging, about
of the population of the United
States is 19 years of age or younger. Write as a decimal.
Remove the % symbol and divide by 100. Add leading zero. Answer:
AMUSEMENT PARKS A popular amusement park reports that
of its visitors will return at least
three times during the year. Write
as a
decimal. B. 0.171
1. 2. 3. 4.
0% D
0% C
0% B
A
0%
A B C D
Write Decimals as Percents Write 0.33 as a percent. 0.33 = 0.33 = 33%
Answer: 0.33 = 33%
Multiply by 100. Add the %.
Write 0.7 as a percent. C. 70%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
POPULATION In 1790, about 0.05 of the population of the United States lived in an urban setting. Write 0.05 as a percent. 0.05 = 0.05 = 5% Answer: 0.05 = 5%
Multiply by 100. Add the % symbol and drop the leading zeros.
POPULATION In 2000, the population of Illinois had increased by 0.086 from 1990. Write 0.086 as a percent. C. 8.6%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
Interactive Lab: Percents
End of the Lesson
Homework – Pg 208-209, # 9-34 all, 38-48 even
Five-Minute Check (over Lesson 4–6) Image Bank Math Tools
Percents Prime Factorization
(over Lesson 4-6)
A. 67%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
Write the ratio 32 per 100 as a percent. D. 32%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
A. 25%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
C. 85%
0% D
A B C 0% D C
0% B
A
0%
1. 2. 3. 4.
(over Lesson 4-6)
Write 55% as a fraction in simplest form. A. B. C. 0% D
0%
A B C 0% D C
A
0%
B
D.
1. 2. 3. 4.
(over Lesson 4-6)
There are 200 people in the audience of a game show. Fifty are chosen to participate. What percent of the audience will be chosen to participate? A. 25%
0% D
A B C 0% D C
B
A
0%
1. 2. 3. 0% 4.
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