By what percent has the global forest area per capita decreased?

Factful math: Grade 5th-6th

Math skills: Percent change

Related Environmental issues: Biodiversity & Deforestation

Global forest area per capita has decreased from 15,000m2 in 1960 to 5,000m2 in 2019. By what percent has the global forest area per capita decreased over the last 60 years?

A. 1%

B. 2%

C. 65%

D. 180%


Answer: C

(14,000 – 5,000)/ 14,000 x 100 = about 65%

Source: Hannay, J., 2022. New Study finds global forest area per capita has decreased by over 60%. IOP Publishing.

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how many calves of North Atlantic right whale are born annually?

Factful math: Grade 3rd-5th

Math skills: Average

Related Environmental issues: Biodiversity

The North Atlantic right whale is one of the most endangered large whale species, and there are fewer than 350 right whales remaining. It is reported that female right whales are having fewer calves. During 2019 and 2022, how many calves were born annually on average?

  1. 9
  2. 13
  3. 20


ANSWER  2

(7+10+20+15) / 4 = 13

Source: NOAA Fisheries. North Atlantic Right Whale.

 


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