If girlfriend buy from a connect in this post, I might earn a commission. This walk not impact the price friend pay. Together an Amazon Associate ns earn native qualifying purchases. Discover more.

You are watching: 9-3/1/3+1=

Posted march 17, 2016 by Presh Talwalkar. Read around me, or email me.

A current test found only 60% the Japanese 20 year olds were able to settle the adhering to question. In the 1980s a study uncovered 90% can solve it. The fall in performance led to quite a stir.

Can you number it out?

Watch the video for mine explanation the the correct answer.

9 – 3 ÷ 1/3 + 1 = ? Viral difficulty From Japan. Correct Answer described

Or keep reading for a message explanation. . ."All will certainly be fine if you usage your psychic for your decisions, and mind just your decisions." since 2007, i have committed my life to share the pleasure of game theory and also mathematics. stclairdrake.net now has over 1,000 complimentary articles with no ads thanks to ar support! aid out and get early access to posts with a pledge on Patreon.

. . . . . . . . . . . . . . . . . . *For those that cannot watch, the exactly answer is 1.

The most typical mistake is creating the 1/3 as:

9 – 3 ÷ 1/3 + 1

Most calculators will not group the 1/3, for this reason the calculator evaluates:

9 – 3/1/3 + 1 = 9 – 3/3 + 1 = 9 – 1 + 1 = 9

The exactly answer is discovered by group 1/3 through parentheses and following the order of operations, with division taking precedence.

9 – 3 ÷ (1/3) + 1 = 9 – 9 + 1 = 0 + 1 = 1

The exactly answer is 1.

Full research (in Japanese, see web page 20 the document). I relied on the English source detailed above and also Google translations various other Japanese media who construed the statistics. Https://www.chukeiren.or.jp/wp/wp-content/uploads/assets/policy_proposal/pdf/01.Teigensyo.pdf

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I operation the stclairdrake.net channel ~ above YouTube, which has actually over 1 million subscribers and 200 million views. I am additionally the writer of The pleasure of video game Theory: An arrival to strategy Thinking, and several other publications which are accessible on Amazon.

(As you could expect, the links for my publications go to your listings top top Amazon. Together an Amazon Associate ns earn indigenous qualifying purchases. This does not influence the price you pay.)

By way of history, I started the Mind her Decisions blog ago in 2007 to share a little bit of math, an individual finance, personal thoughts, and game theory. It"s been fairly a journey! I thank everyone that has actually shared mine work, and I am very grateful because that coverage in the press, consisting of the Shorty Awards, The Telegraph, Freakonomics, and many other well-known outlets.

I studied Economics and also Mathematics at Stanford University.

People frequently ask how I make the videos. Like plenty of YouTubers ns use famous software come prepare mine videos. You deserve to search for animation software tutorials on YouTube come learn exactly how to do videos. It is in prepared--animation is time consuming and software have the right to be expensive!

Feel cost-free to send me an e-mail . I acquire so numerous emails that I might not reply, yet I conserve all suggestions for puzzles/video topics.


If you purchase through this links, I might be compensated for purchases make on Amazon. As an Amazon Associate ns earn from qualifying purchases. This does not affect the price girlfriend pay.

Book ratings are from June 2021.

(US and worldwide links) https://stclairdrake.net/blog/my-books

Mind her Decisions is a compilation the 5 books:

(1) The delight of game Theory: An introduction to strategy Thinking (2) 40 Paradoxes in Logic, Probability, and also Game theory (3) The Irrationality Illusion: just how To do Smart Decisions and Overcome bias (4) The ideal Mental mathematics Tricks (5) Multiply numbers By drawing Lines

The joy of video game Theory shows how you have the right to use math to out-think your competition. (rated 4.2/5 stars ~ above 200 reviews)

40 Paradoxes in Logic, Probability, and Game Theory contains thought-provoking and counter-intuitive results. (rated 4.1/5 stars top top 30 reviews)


The Irrationality Illusion: just how To make Smart Decisions and Overcome Bias is a handbook that defines the countless ways we space biased about decision-making and offers methods to make smart decisions. (rated 4/5 stars ~ above 17 reviews)


The ideal Mental math Tricks teaches exactly how you have the right to look like a mathematics genius by solving troubles in your head (rated 4.2/5 stars ~ above 57 reviews)


Multiply numbers By illustration Lines This publication is a reference overview for my video clip that has actually over 1 million views on a geometric technique to main point numbers. (rated 4.1/5 stars top top 23 reviews)


Mind your Puzzles is a collection of the three "Math Puzzles" books, volumes 1, 2, and 3. The puzzles topics incorporate the mathematical subjects consisting of geometry, probability, logic, and game theory.

Math Puzzles Volume 1 attributes classic brain teasers and riddles with complete solutions for difficulties in counting, geometry, probability, and also game theory. Volume 1 is rated 4.4/5 stars on 75 reviews.

Math Puzzles Volume 2 is a sequel publication with more good problems. (rated 4.3/5 stars ~ above 21 reviews)

Math Puzzles Volume 3 is the third in the series. (rated 4.3/5 stars top top 17 reviews)


Teachers and students approximately the world often email me about the books. Because education can have together a vast impact, I try to do the ebooks available as commonly as feasible at as low a price as possible.

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