Viral Math Problem – Try It

      2 Comments on Viral Math Problem – Try It

This is viral math brainteaser from Japan.



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



Most people will find answer as 9 but the Correct Answer is 1
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)

Sources (Japanese)



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)

  2. Ramiro Berendt

    I come here searching for Viral Math Problem
    – Try It. Now, Mathematics comes from many different sorts of problems.
    Initially these were within commerce, land way of measuring, structures and later astronomy; today, all sciences suggest problems researched by
    mathematicians, and many problems occur within mathematics itself.
    For instance, the physicist Richard Feynman developed the path important formulation of quantum technicians utilizing a combo of mathematical reasoning and physical understanding, and today’s string theory, a still-developing technological
    theory which endeavors to unify the four important forces of dynamics, continues
    to motivate new mathematics.
    Many mathematical things, such as collections of
    amounts and functions, display internal structure because
    of procedures or relationships that are identified on the place.

    Mathematics then studies properties of these sets that may be expressed
    in conditions of that framework; for instance quantity theory studies properties of the
    group of integers that may be expressed in conditions
    of arithmetic functions. In addition, it frequently happens that different such set up sets (or
    buildings) display similar properties, rendering it possible, by an additional step of abstraction, to convey axioms for a category of constructions, and then research at once the complete
    class of buildings fulfilling these axioms.

    Thus you can study communities, rings, domains and other abstract systems; jointly such studies (for buildings identified by algebraic functions) constitute the area of abstract algebra.

    Here: To be able to clarify the foundations of mathematics, the areas of mathematical logic and place theory were developed.

    Mathematical logic includes the mathematical analysis of logic and the applications of formal logic to
    the areas of mathematics; placed theory is the branch of mathematics that
    studies pieces or series of things. Category theory, which offers within an abstract
    way with mathematical buildings and connections between them, continues to be in development.


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