How many species are threatened with extinction?

Grade level: 4th – 5th grades

Skills: Rounding (whole numbers)

Related environmental issues: Biodiversity

The number of species that are at risk of becoming scarce has been increasing. They are threatened with extinction mainly because they lost their homes. Humans are responsible for the habitat loss when we destroy their habitats by developing housing, industry, and agriculture. The table below shows number of threatened species.

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  1. Round the number of threatened insects to the nearest thousands.
  2. Round the number of threatened fishes to the nearest hundreds.
  3. Round the number of threatened plants to the nearest thousands.
  4. Round the number of threatened mammals to the nearest tens.
  5. Round the number of total threatened species to the nearest ten thousands.

 

Source: IUCN Red List of Threatened Species, 2020, Summary statistics (Table 1a)


Answer keys

1.2,000
2.2,700
3.16,000
4.1,240
5.30,000

 

 


 

The 225 Math Quizzes That Will Make You An Environmental Expert (2019) is available from Amazon.com.  (paperback)

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How are we protected from dangerous air pollution?

Grade level: 4th – 6th grades

Skills: Place value (whole numbers)

Related environmental issues: Air

Clean air is essential for our health.The United States has protected Americans from dangerous air pollution that cause asthma, lung diseases, and early death by enacting the law called the Clean Air Act. It is estimated that the Clean Air Act will save at least 230,000lives by 2020 in this country.

clean_air

  1. What digit is in the tens place of 230,000?
  2. What place is the 3 in 230,000?
  3. How many thousands are in this number?
  4. How many hundreds are represented by the 2?
  5. How many ones are represented by the 3?
  6. Which number represents 230,000?
a.23  x 102
b.23 x 103
c.23 x 104
d.23 x 105

 

Source: U.S. EPA, Clean Air Act Overview.

Photo: WWF

 


Answer keys

1.0
2.Ten thousands
3.230
4.2,000
5.30,000
6.c

 

 


 

The 225 Math Quizzes That Will Make You An Environmental Expert (2019) is available from Amazon.com.  (paperback)

Screen Shot 2019-01-26 at 10.54.15 AM

 

 

About this book>>>

Table of Contents >>>

Sample Quizzes >>>

Answer Key >>>