Author: MindYourDecisions

What is 6÷2(1+2) = ? This problem went viral and generated millions of comments on Facebook, Twitter, YouTube and social media sites. I explain how to get the correct answer by using the modern interpretation of the order of operations. I also explain how you would get a different answer under historical usage of the division symbol. (Note: some people write 6/2(1 + 2) = but this has the same answer.)

I studied Mathematics and Economics at Stanford. Press coverage of my work:

*I get many, many emails about this problem and am unable to reply to them.

Blog (text explanation): http://wp.me/p6aMk-4OV

Slate explains the history of the division symbol

http://www.slate.com/articles/health_and_science/science/2013/03/facebook_math_problem_why_pemdas_doesn_t_always_give_a_clear_answer.html

Here is a 1917 article from “The American Mathematical Monthly” that explains the usage of the division symbol as an exception to the order of operations

http://www.jstor.org/stable/2972726?seq=1#page_scan_tab_contents

Google evaluation

https://www.google.com/#q=6%C3%B72(1%2B2)

WolframAlpha evaluation

http://www.wolframalpha.com/input/?i=6%C3%B72(1%2B2)

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My Books

Mind Your Decisions: Five Book Compilation

https://amzn.to/2pbJ4wR

A collection of 5 books:

“The Joy of Game Theory” rated 4.1/5 stars on 44 reviews

http://amzn.to/1uQvA20

“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” rated 3.5/5 stars on 4 reviews

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“40 Paradoxes in Logic, Probability, and Game Theory” rated 4.4/5 stars on 13 reviews

http://amzn.to/1LOCI4U

“The Best Mental Math Tricks” rated 4.7/5 stars on 8 reviews

http://amzn.to/18maAdo

“Multiply Numbers By Drawing Lines” rated 4.3/5 stars on 6 reviews

http://amzn.to/XRm7M4

Mind Your Puzzles: Collection Of Volumes 1 To 3

https://amzn.to/2mMdrJr

A collection of 3 books:

“Math Puzzles Volume 1” rated 4.4/5 stars on 13 reviews

http://amzn.to/1GhUUSH

“Math Puzzles Volume 2” rated 4.5/5 stars on 6 reviews

http://amzn.to/1NKbyCs

“Math Puzzles Volume 3” rated 4.1/5 stars on 7 reviews

http://amzn.to/1NKbGlp

Connect with me

My Blog: https://mindyourdecisions.com/blog/

Twitter: https://twitter.com/preshtalwalkar

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2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter. .

Video source Youtube