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





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

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TOP SUN-POWERED states in the United States

Grade level: 4th – 5th grades

Skills: Rounding

Related environmental issues: Renewable Energy

The table below shows how much solar power was generated from the top five solar power generating states in the United States in December, 2017.

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  1. Round the number of Nevada to the nearest hundreds.
  2. Rounded to the nearest tens, will North Carolina and Arizona have the same number or not?
  3. The number of which state becomes 200 when rounded to the nearest hundreds? List all.
  4. When rounded to the nearest ______, the number of California becomes 2,000.  A) ones B) tens C) hundreds D) thousands



The 5MW-Walt Disney World Solar Facility near the Walt Disney World Resort. (Orlando Sentinel)


Sources: U.S. Energy Information Administration, 2018. Electric Power Monthly (Table 1.17.A. Net Generation from Solar Photovoltaic)



Answer Keys

  1. 200
  2. Yes.  Both numbers are rounded to 340
  3. Nevada and Texas
  4. D