Viral Math Problem – Try It

      2 Comments on Viral Math Problem – Try It

This is viral math brainteaser from Japan.

 solve-this-math-brainteaser-if-you-can

 

It is Easy But Tricky
9 – 3 ÷ 1/3 + 1 = ?

 

 

Most people will find answer as 9 but the Correct Answer is 1
Explanation:
The most common mistake is writing the 1/3 as: 9 – 3 ÷ 1/3 + 1
Most calculators will not group the 1/3, so the calculator evaluates: 9 – 3/1/3 + 1
= 9 – 3/3 + 1
= 9 – 1 + 1
= 9
The correct answer is found by grouping 1/3 with parentheses and following the order of operations, with division taking precedence.
9 – 3 ÷ (1/3) + 1
= 9 – 9 + 1
= 0 + 1
= 1

 

Source (English)
http://en.rocketnews24.com/2015/12/05/does-this-math-problem-prove-that-japans-20-somethings-are-getting-dumber/

Sources (Japanese)
http://www.j-cast.com/2015/12/03252296.html?p=all
http://www.yukawanet.com/archives/4618548.html

Comments

comments

2 comments on “Viral Math Problem – Try It

  1. Mark Southam

    You answer is still wrong the order of operation has addition BEFORE subtraction so the answer is -1 .. 9 – 9 + 1 …. 9 -10 = -1 … you should always follow the order of operations PEDMAS (BEDMAS)

    Reply
  2. Ramiro Berendt

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    Reply

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