Pandemic Diseases – The case of Swine Flu (1918 – 1919)


Grade level: 5th – 6th grades

Skills: Line graphs

Related environmental issues: Others


Throughout history, there have been a number of diseases that have spread rapidly throughout much of the world such as smallpox, tuberculosis, black death, swine flu, and HIV/AIDS. These pandemic diseases have often killed millions of people.

The number of people who is affected by these pandemic diseases sometimes goes up and down for a couple of times like waves.  The line graph below shows how many people died from swine flu in England between 1918 and 1919.

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  1. When did swine flu cause the largest number of deaths in England?  A) July 1918 B) November 1918 C) January 1919 D) March 1919
  2. When did swine flu cause the second largest number of deaths in England?  A) July 1918 B) November 1918 C) January 1919 D) March 1919
  3. How many waves are there?
  4. When swine flu pandemic returned as the second wave, was it more severe or less severe? Explain.


Source: European Center of Disease Prevention and Control (ECDC)

Retrieved form: Dworkin G, (2009) WHO moves closer to pandemic declaration. Daily Kors.

Answer keys

4.Less severe: Less people died in the second wave than the first wave




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





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

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