Freezing temperatures on Valentine’s Day

[FACTFUL MATH] Grade level: 4 – 6th grades

Math skills: Subtraction of negative numbers

Related Environmental issues: Weather

Extreme cold air from the Arctic is expected to bring freezing temperatures to many parts of the United States on Valentine’s Day.

The table below shows daily forecast of Minneapolis, MN.

  1. Which day is the warmest?
  2. Which day is the coldest?
  3. What is the difference between high and low temperatures of Valentine’s Day?


  1. Monday
  2. Sunday
  3. 14 degrees

-6 – (-20) = -6 + 20 = 14

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Factful 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 uninformed decisions and ultimately help develop their critical thinking skills. (Read more)

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Published: March 26, 2020

Price: $6.25