Population Math Concepts & Equations You Should Memorize

Population Math Concepts & Equations You Should Memorize

Population Math Concepts & Equations You Should Memorize:

Population Density = (Population)For example: (2,700,000 people) = 29 people per square km

(AREA) (9,166,605 sq km)

Birth or Death Rates = (# of births/deaths per year)For example: (23,452 births) = 0.025 = 2.5% birth rate

(Total population) (942,271 people) *CBR/CDR per 1000*

Finding Population Growth Rate (r):

r = (births – death)Note: This does not include immigration/emigration. If it did, it would be (b + e) – (i + d)

(total population) total population

For example: (20,000 births – 15,000 deaths) = 0.01 = 1.0%

(500,000 people)

Doubling Time = THE RULE OF 70(70%) or (0.7)

r (in percent form) r (in decimal form)

Finding Percent Growth

(Final amount – Initial amount) x 100What is the percent inc in sales from 10K to 12K in the month of Oct?

Initial amount[(12-10)/10]*100 = (2/10)*100 = 20% increase

Population Math Concepts & Equations You Should Memorize:

Population Density = (Population)For example: (2,700,000 people) = 29 people per square km

(AREA) (9,166,605 sq km)

Birth or Death Rates = (# of births/deaths per year)For example: (23,452 births) = 0.025 = 2.5% birth rate

(Total population) (942,271 people) *CBR/CDR per 1000*

Finding Population Growth Rate (r):

r = (births – death)Note: This does not include immigration/emigration. If it did, it would be (b + e) – (i + d)

(total population) total population

For example: (20,000 births – 15,000 deaths) = 0.01 = 1.0%

(500,000 people)

Doubling Time = THE RULE OF 70(70%) or (0.7)

r (in percent form) r (in decimal form)

Finding Percent Growth

(Final amount – Initial amount) x 100What is the percent inc in sales from 10K to 12K in the month of Oct?

Initial amount[(12-10)/10]*100 = (2/10)*100 = 20% increase

  1. At the end of 2002, there were 1,284.53 million people living in China. China is the third largest country in the world with an area of 9.6 million square kilometers. What is the population density of China?
  2. China has 130.04 million hectares of land under cultivation. What is the average amount of cultivated land per capita?
  3. At the end of 2002, there were 502 million urban residents. What percentage of the total population were living in cities?
  4. At the end of 2002, there were 661.15 million males in China. What percent of the total population were males?
  5. 22.4% of China’s total population was in the age group of zero to age fourteen. How many children is that? If the average number of students in each elementary school is 500, how many elementary schools are needed in China (assume that all children between the ages of 0 and 14 attend)?
  6. In 2002, 16.47 million babies were born in China. What was the birth rate (as a percentage and per 1000 – also known as crude birth rate)?
  7. In 2002, 8.21 million people died in China. What was the death rate (as a percentage and per 1,000)?
  8. What was the total overall growth rate of China’s population in 2002?
  9. Using the rate from question 8, how many years will it take for China’s population to double?
  10. In 2002 about 1.1 million cars were sold in China. In 2003 a little more than 2 million cars were sold. What was the percent increase in car sales?
  11. Most people living in urban China use bicycles for transportation. Only three people per 1000 actually own a car. How many people own cars in China?
  12. Oddly, while China has relatively few cars on the highways compared to the size of its population, they have the highest number of traffic fatalities in the world: more than 100,000 per year. What is the per capita death rate in China for car fatalities?
  1. At the end of 2002, there were 1,284.53 million people living in China. China is the third largest country in the world with an area of 9.6 million square kilometers. What is the population density of China?
  2. China has 130.04 million hectares of land under cultivation. What is the average amount of cultivated land per capita?
  3. At the end of 2002, there were 502 million urban residents. What percentage of the total population were living in cities?
  4. At the end of 2002, there were 661.15 million males in China. What percent of the total population were males?
  5. 22.4% of China’s total population was in the age group of zero to age fourteen. How many children is that? If the average number of students in each elementary school is 500, how many elementary schools are needed in China (assume that all children between the ages of 0 and 14 attend)?
  6. In 2002, 16.47 million babies were born in China. What was the birth rate (as a percentage and per 1000 – also known as crude birth rate)?
  7. In 2002, 8.21 million people died in China. What was the death rate (as a percentage and per 1,000)?
  8. What was the total overall growth rate of China’s population in 2002?
  9. Using the rate from question 8, how many years will it take for China’s population to double?
  10. In 2002 about 1.1 million cars were sold in China. In 2003 a little more than 2 million cars were sold. What was the percent increase in car sales?
  11. Most people living in urban China use bicycles for transportation. Only three people per 1000 actually own a car. How many people own cars in China?
  12. Oddly, while China has relatively few cars on the highways compared to the size of its population, they have the highest number of traffic fatalities in the world: more than 100,000 per year. What is the per capita death rate in China for car fatalities?
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