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Here are a few recommended readings before getting started with this lesson.
Multiply 1300000000cm by 100cm1māā 1000m1kmā
Cross out common factors
Cancel out common factors
Multiply fractions
Calculate quotient
The United States of America has an area of 9147420 square kilometers. In mid-2020, the total population was 331923317 people.
Find the population density in people per square mile. Round the answer to the nearest integer. Then, based on the units, write a few sentences to describe what population density measures.In the United States of America, the population density is 94 people per square mile. The population density measures the number of people per unit of area.
People per square mile can be written as mi2peopleā. This implies that the population density is expressed as a ratio. Remember that 1 square kilometer is equal to 0.386102 square mile.
Multiply 9147420km2 by 1km20.386102mi2ā
The population density of the United States of America is approximately 94 people per squareĀ mile.
This statement assumes that the total population is spread out evenly across the United States.
Mark wants to paint all of the walls of his bedroom except for the wall that contains the door. Each rectangular wall is 2.8 meters high. The paint he will use is sold in 5-liter cans — the price per liter is $25.
After painting for a few minutes, Mark noticed that 5 square meters can be covered with one liter of paint.
Dimensions | |
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Wall 1 | ā1āhā=4.75m=2.8mā
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Wall 2 | ā2āhā=4.75m=2.8mā
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Wall 3 | ā3āhā=3m=2.8mā
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On the applet, the model and the actual object are shown. Using the given information, find the scale or the size of either the model or the actual object.
Tadeo wants to buy a cheap phone plan for calling his friends and family. He asked Ali and Ramsha how much they pay per call.
Initially, Tadeo decided to take Ramsha's plan since she paid less. Later, he realized that this information is not helpful since he does not know the duration of each of the calls made by Ali and Ramsha.
Price per call is not an appropriate unit.
Therefore, Tadeo decided to ask Ali and Ramsha how long each phone call lasted.
Person | Scale of the Plan |
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Ali | 40min$10ā=$0.25 per minute |
Ramsha | 30min$8āā$0.27 per minute |