If you buy from a link in this post, I may earn a commission. This does not affect the price you pay. As an Amazon Associate I earn from qualifying purchases. Learn more.

You are watching: 7 7 7 7 7 7 7

Posted November 3, 2016 By Presh Talwalkar. Read about me, or email me.


Here we go again, another order of operations problem. This equation has been shared on Twitter and Facebook and many people are confused about the correct answer.

7 + 7 ÷ 7 + 7 × 7 – 7 =

In the following video I explain the answer and present two different ways to simplify the expression.

What Is 7 + 7 ÷ 7 + 7 × 7 + 7 Equal To? The Correct Answer Explained

Or keep reading for a text explanation. . ."All will be well if you use your mind for your decisions, and mind only your decisions." Since 2007, I have devoted my life to sharing the joy of game theory and mathematics. yellowcomic.com now has over 1,000 free articles with no ads thanks to community support! Help out and get early access to posts with a pledge on Patreon.

. . . . . . MIND . YOUR . DECISIONS . BY . PRESH . TALWALKAR . . . . The Correct Answer

The correct answer is 50.

One way to see this is to translate the expression 7 + 7 ÷ 7 + 7 × 7 – 7 = into a situation about money.

The expression begins with 7, so you start out with $7.

The next part is “+ 7 ÷ 7.” This means you get a 1/7 share of $7. Since a 1/7 share of $7 is $1, that means you get $1. At this point you have $7 + $1 = $8.

The next part is “+ 7 × 7.” This means you get $7 more, repeated 7 times. Since a $7 times 7 is $49, that means you get $49 in total. At this point you have $8 + $49 = $57.

The last part is “- 7.” That means $7 is taken away from you. You subtract $7, so you end up with $57 – $7 = $50.

The correct answer is therefore 50.

The expression can also be simplified by the order of operations, often remembered by the acronyms PEMDAS/BODMAS.

First evaluate Parentheses/Brackets, then evaluate Exponents/Orders, then evaluate Multiplication-Division, and finally evaluate Addition-Subtraction.

The expression 7 + 7 ÷ 7 + 7 × 7 – 7 has no parentheses or exponents, so we evaluate multiplication and division.

7 ÷ 7 = 1 7 × 7 = 49

This means

7 + 7 ÷ 7 + 7 × 7 – 7 = 7 + 1 + 49 – 7

Now we can evaluate the addition and the subtraction from left to right.

= 8 + 49 – 7 = 57 – 7 = 50

The correct answer is 50.


PRESH TALWALKAR

I run the yellowcomic.com channel on YouTube, which has over 1 million subscribers and 200 million views. I am also the author of The Joy of Game Theory: An Introduction to Strategic Thinking, and several other books which are available on Amazon.

(As you might expect, the links for my books go to their listings on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.)

By way of history, I started the Mind Your Decisions blog back in 2007 to share a bit of math, personal finance, personal thoughts, and game theory. It"s been quite a journey! I thank everyone that has shared my work, and I am very grateful for coverage in the press, including the Shorty Awards, The Telegraph, Freakonomics, and many other popular outlets.

I studied Economics and Mathematics at Stanford University.

People often ask how I make the videos. Like many YouTubers I use popular software to prepare my videos. You can search for animation software tutorials on YouTube to learn how to make videos. Be prepared--animation is time consuming and software can be expensive!

Feel free to send me an email . I get so many emails that I may not reply, but I save all suggestions for puzzles/video topics.


MY BOOKS

If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.

Book ratings are from June 2021.

(US and worldwide links) https://yellowcomic.com/blog/my-books
*

Mind Your Decisions is a compilation of 5 books:

(1) The Joy of Game Theory: An Introduction to Strategic Thinking (2) 40 Paradoxes in Logic, Probability, and Game Theory (3) The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias (4) The Best Mental Math Tricks (5) Multiply Numbers By Drawing Lines
*

The Joy of Game Theory shows how you can use math to out-think your competition. (rated 4.2/5 stars on 200 reviews)

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

*

The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4/5 stars on 17 reviews)

*

The Best Mental Math Tricks teaches how you can look like a math genius by solving problems in your head (rated 4.2/5 stars on 57 reviews)

*

Multiply Numbers By Drawing Lines This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 4.1/5 stars on 23 reviews)

*

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

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

Math Puzzles Volume 2 is a sequel book with more great problems. (rated 4.3/5 stars on 21 reviews)

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

KINDLE UNLIMITED

Teachers and students around the world often email me about the books. Since education can have such a huge impact, I try to make the ebooks available as widely as possible at as low a price as possible.

Currently you can read most of my ebooks through Amazon"s "Kindle Unlimited" program. Included in the subscription you will get access to millions of ebooks. You don"t need a Kindle device: you can install the Kindle app on any smartphone/tablet/computer/etc. I have compiled links to programs in some countries below. Please check your local Amazon website for availability and program terms.

US, list of my books (US) UK, list of my books (UK) Canada, book results (CA) Germany, list of my books (DE) France, list of my books (FR) India, list of my books (IN) Australia, book results (AU) Italy, list of my books (IT) Spain, list of my books (ES) Japan, list of my books (JP) Brazil, book results (BR) Mexico, book results (MX)

MERCHANDISE

Grab a mug, tshirt, and more at the official site for merchandise: Mind Your Decisions at Teespring.

See more: Is A Baseball Diamond Is A Square ? A Baseball Diamond Is A Square With Side 90 Ft


3 thoughts on “What Is 7 + 7 ÷ 7 + 7 × 7 – 7 Equal To? The Correct Answer Explained”

Comments are closed.


Previous Previous post: The Best First Move In Misere Tic-Tac-Toe (3-In-A-Row Is Losing). Game Theory Tuesdays
Next Next post: Can You Solve The Probability The Newborn Is A Boy? Technical Interview Question – Sunday Puzzle