lesson 5-1 ratios and percents. definition percent- a ratio that compares a number to 100
DESCRIPTION
Example 1 POPULATION: According to the 2000 U.S. Census, 22 out of every 100 people living in West Virginia were younger than 18. Write the ratio as a percentTRANSCRIPT
Lesson 5-1
Ratios and Percents
Definition
• Percent- A ratio that compares a number to 100.
Example 1
• POPULATION: According to the 2000 U.S. Census, 22 out of every 100 people living in West Virginia were younger than 18.
• Write the ratio as a percent
Example 2
• SPORTS: At a recent triathlon, 180 women competed for every 100 women who competed ten years earlier.
• Write the ratio as a percent
Write each ratio or fraction as a percent.
• POPULATION: According to the 2000 U.S. census, 13 out of every 100 people living in Delaware were 65 or older.
• BASEBALL: In 2001, Manny Ramirez got on base 40.5 times for every 100 times he was at bat.
Example 3
• CARS: About 1 out of 5 luxury cars manufactured in the United States is white.
• Write the ratio as a percent• Cross multiply to find x.
• x = 20%
Example 4
• TRAVEL: About of travelers use scheduled buses.
• Cross multiply to find x.
• x = 0.5 %
• TRANSPORTATION: About 4 out of 5 commuters in the United States drive or carpool to work.
• Find the percent.
• INTERNET: In 2000, about of the population in Peru used the internet.
• Find the percent.
Example 5• ENVIRONMENT: The circle graph shows an
estimate of the percent of each type of trash in landfills. Write the percent for paper and for plastic as a fraction in simplest form.
SCHEDULE: The table below shows an estimate of the percent of his day that Peter spends on each activity. Write the percent for eating and sleeping as fractions in simplest form.