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 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.

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  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)

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