Are we having a longer heat wave season or shorter?

Factful math: Grade 5-6th

Math skills: Percent increase

Related Environmental issues: Climate change

The bar graph below shows the average length of heat wave season since the 1960s.

  1. What is the percent increase from the number of heat wave season in the 1960s to the 2010s?

A. 20% B. 70% C. 200% D. 700%

Answer C

(69 – 22)/22×100 = about 200%

Source) US EPA, Climate change indicators: heat waves (

Factful Environmental Math Problems (2020)

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

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