Multiplying and Dividing Rational Numbers
Solve.
−2(−5 + 9)
-8
Convert 3 5/8 into a decimal.
3.625
Sarah buys 8 packages, each with 20 balloons, and uses 1/4 of them to decorate the hall. Write and evaluate an expression to find how many balloons Sarah has left.
120 balloons
An Olympic swimming pool is 25 meters by 50 meters. A scale drawing has the pool by 50 cm by 100 cm. What is the scale drawing in centimeters to meters?
1 centimeter to 1/2 meter
What are the three steps in the Three Reads Method?
1. About - What is the problem about without using numbers?
2. Circle Numbers and Box Important Words
3. What is the Question?
Kaleb’s football team lost 2 yards on each of 3 consecutive plays. How much yards did they lose in total?
-6 yards
The temperature dropped steadily by 40 °F over a 20-hour period. Find the quotient of how much the temperature drops per hour.
-2
Liu Tse is 6 years older than 4 times the age of her daughter, Lan. Lan will be 9 years old in 3 years.
What is Liu Tse’s age?
30 years old
If a scale drawing has the drawing length of 2 inches for 10 feet. How long is the scale drawing if the actual feet of an object is 25 feet?
5 feet
Joanna has $25.00 to spend at the zoo. Admission costs $12.25, and she plans to buy a combo meal for $8.92 at the snack bar for lunch. It costs $2.00 to buy a food pellet to feed the giraffes. How much money does Joanna have at the end of the day, to the nearest dollar?
What is the problem ABOUT? Give a short summary.
Joanna is going to the zoo.
Thomas writes a multiplication expression with eight rational factors. Half of the factors are positive, and half are negative. Is the product positive or negative?
Positive
Susan has 3/4 cups of raisins and she's dividing it into 3/8 cup servings. How much is in each cup?
Hint: Convert into decimal
2 cups
Luis is hiking at a park to see a lake. He sees the sign shown that says the lake is 4.9 miles away. Luis knows that he can hike at an average rate of 1/3 miles in 6 minutes. How many hours will it take Luis to reach the lake?
1.47 hours
If the Empire State Building is 1,250 feet and the souvenir shop sells a scaled version of it at a height of 6 inches. What is the scale?
Joanna has $25.00 to spend at the zoo. Admission costs $12.25, and she plans to buy a combo meal for $8.92 at the snack bar for lunch. It costs $2.00 to buy a food pellet to feed the giraffes. How much money does Joanna have at the end of the day, to the nearest dollar?
What do you CIRCLE and/or BOX?
$25
$12.25
$8.92
$2.00
Find the Product
(−4)(−8)(−5)
-160
Find the Quotient
7/10 divided by 1/5
3.5
A laptop costs $356.75 when it is new. The value of the computer is expected to change by −11 3/4 % per year. What is the expected value, to the nearest cent, of the computer after 3 years?
Hint: Round your answer to the nearest cent.
$245.19
A student wants to draw a 1/8 scale version of their textbook that is 8 inches by 10 inches. What is the dimensions of the scale drawing?
1 inch by 1.25 inches
Joanna has $25.00 to spend at the zoo. Admission costs $12.25, and she plans to buy a combo meal for $8.92 at the snack bar for lunch. It costs $2.00 to buy a food pellet to feed the giraffes. How much money does Joanna have at the end of the day, to the nearest dollar?
What is the Question?
How much money does Joanna have at the end of the day, to the nearest dollar?
The value of a collectible basketball card is being sold online for $60 dollars. It decreases in value of $12 every 6 months. What is the value of the card in a year?
$48
A butterfly is flying 8 3/4 feet above the ground. It descends at a steady rate to a spot 6 1/4 feet above the ground in 1 2/3 minutes. What is the butterfly’s change in elevation in feet per minute?
-1 1/2 feet
In 2016, a maglev train in Japan traveled 1.1 miles in 10 4/5 seconds. Find the speed of the train in miles per hour.
366 2/3 or 366.67 mph
An interior designer is designing a house floor plan. The scale is every 2 cm = 9 ft. The living room is 3 cm by 5 cm. So what are the real dimensions of the living room?
13.5 feet by 22.5 feet
Joanna has $25.00 to spend at the zoo. Admission costs $12.25, and she plans to buy a combo meal for $8.92 at the snack bar for lunch. It costs $2.00 to buy a food pellet to feed the giraffes. How much money does Joanna have at the end of the day, to the nearest dollar?
SOLVE.
1 dollar