Which county had more electric cars – the U.S. or Japan?

Grade level: 4th – 6th grades

Skills:DECIMALS (PLACE VALUE & ROUNDING)

Related environmental issues: Others

 

The number of electric cars on the road has been significantly increasing.  There were over 5 million electric cars running in the world in 2018. The table below shows the number of electric cars sold in four countries in 2018.

 

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  1. What place is the 1 in the number of electric cars sold in Canada?
  2. Round the number of electric cars sold in the United Kingdom to the nearest tenth.
  3. Round the number of electric cars sold in Japan to the nearest whole number.
  4. What digit is in the hundredth place in the number of electric cars sold in the United States?
  5. The expanded form of the number of electric cars sold in China* is 1,000 + 70 + 8 + 0.5 + 0.03. Write the number in the standard form.

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International Energy Agency, 2019. Global EV Outlook 2019 (Figure 1).


 

Answer keys

1. The tenth place
2. 50.4
3. 50
4. 2
5. 1,078.53 (*thousand)

 

Factual Environmental Math Problems (2020)

Just published and now available from Amazon  (paperback)

About this book

The objective of Factful Environmental Math Problems is to cultivate our young people’s skills to analyze and evaluate fact-based data for understanding our world, while improving their math skills and critical thinking skills.

With the rise of the Internet and new technology, building skills to analyze and evaluate fact-based data becomes increasingly important for our young people to prepare for this rapidly changing world. These skills minimize their chances of being brainwashed by false information and making uniformed decisions and ultimately help develop their critical thinking skills. (Read more)

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Published: March 26, 2020

Price: $6.25

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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