정수와 유리수

Zoo The Lewis and Chousmith families are planning to go to the zoo together. Adult tickets cost $\char36 29.95$ and children’s tickets cost $\char36 19.95.$ What will the total cost be for $4$ adults and $7$ children?

Ice Skating Jasmine wants to have her birthday party at the local ice skating rink. It will cost $\char36 8.25$ per child and $\char36 12.95$ per adult. What will the total cost be for $12$ children and $3$ adults?

Paycheck Annie has two jobs. She gets paid $\char36 14.04$ per hour for tutoring at City College and $\char36 8.75$ per hour at a coffee shop. Last week she tutored for $8$ hours and worked at the coffee shop for $15$ hours.

ⓐ How much did she earn?

ⓑ If she had worked all $23$ hours as a tutor instead of working both jobs, how much more would she have earned?

Paycheck Jake has two jobs. He gets paid $\char36 7.95$ per hour at the college cafeteria and $\char36 20.25$ at the art gallery. Last week he worked $12$ hours at the cafeteria and $5$ hours at the art gallery.

ⓐ How much did he earn?

ⓑ If he had worked all $17$ hours at the art gallery instead of working both jobs, how much more would he have earned?

At the 2010 winter Olympics, two skiers took the silver and bronze medals in the Men's Super-G ski event. Miller's time was $1$ minute $30.62$ seconds and Weibrecht's time was $1$ minute $30.65$ seconds. Find the difference in their times and then write the name of that decimal.

Convert the percent to: ⓐ a fraction and ⓑ a decimal

The U.S. Census estimated that in $2013,44\%$ of the population of Boston age $25$ or older have a bachelor's or higher degrees.

In $2000,4.2\%$ of the United States population was of Asian descent. (Source: www.census.gov)

According to government data, in $2013$ the number of cell phones in India was $70.23\%$ of the population.

Insurance copayment Carrie had to have $5$ fillings done. Each filling cost $\char36 80.$ Her dental insurance required her to pay $20\%$ of the cost. Calculate Carrie’s cost

1. ⓐ by finding her copay for each filling, then finding her total cost for $5$ fillings, and
2. ⓑ by multiplying $5(0.20)(80).$
3. ⓒ Which of the Properties of Real Numbers did you use for part (b)?

Cooking time Helen bought a $\text{24-pound}$ turkey for her family’s Thanksgiving dinner and wants to know what time to put the turkey in the oven. She wants to allow $20$ minutes per pound cooking time.

1. ⓐ Calculate the length of time needed to roast the turkey by multiplying $24\cdot 20$ to find the number of minutes and then multiplying the product by $\frac{1}{60}$ to convert minutes into hours.
2. ⓑ Multiply $24\left(20\cdot \frac{1}{60}\right).$
3. ⓒ Which of the Properties of Real Numbers allows you to multiply $24\left(20\cdot \frac{1}{60}\right)$ instead of $(24\cdot 20)\frac{1}{60}?$

Writing a Check Marissa’s kitchen remodeling cost $18,549. She wrote a check to the contractor. Write the amount paid in words.

Remodeling a Kitchen Marissa’s kitchen remodeling cost $18,549, Round the cost to the nearest ⓐ ten ⓑ hundred ⓒ thousand and ⓓ ten-thousand.

Population The population of China was 1,339,724,852 on November 1, 2010. Round the population to the nearest ⓐ billion ⓑ hundred-million; and ⓒ million.

Elevation The highest elevation in the United States is Mount McKinley, Alaska, at 20,320 feet above sea level. The lowest elevation is Death Valley, California, at 282 feet below sea level.

Use integers to write the elevation of:

ⓐ Mount McKinley.

ⓑ Death Valley.

Extreme temperatures The highest recorded temperature on Earth was $57^\circ$ Celsius. The lowest recorded temperature was $90^\circ \,\text{below}\,0^\circ$ Celsius.

Use integers to write the:

• ⓐ highest recorded temperature.
• ⓑ lowest recorded temperature.

In the morning, the temperature in Urbana, Illinois was 11 degrees. By mid-afternoon, the temperature had dropped to $-9$ degrees. What was the difference of the morning and afternoon temperatures?

In the morning, the temperature in Anchorage, Alaska was 15 degrees. By mid-afternoon the temperature had dropped to 30 degrees below zero. What was the difference in the morning and afternoon temperatures?

The temperature in Denver was $-6$ degrees at lunchtime. By sunset the temperature had dropped to $-15$ degrees. What was the difference in the lunchtime and sunset temperatures?

Temperature On January $15,$ the high temperature in Anaheim, California, was $84^\circ .$ That same day, the high temperature in Embarrass, Minnesota was $-12^\circ .$ What was the difference between the temperature in Anaheim and the temperature in Embarrass?

Temperature On January $21,$ the high temperature in Palm Springs, California, was $89^\circ ,$ and the high temperature in Whitefield, New Hampshire was $-31^\circ .$ What was the difference between the temperature in Palm Springs and the temperature in Whitefield?