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# Viral Math Problem – Try It

This is viral math brainteaser from Japan.

## By Kumar

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## 4 replies on “Viral Math Problem – Try It”

Mark Southamsays:

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)

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– Try It. Now, Mathematics comes from many different sorts of problems.
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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.

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Davo67says:

Personally think my answer is better and clearer:

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
rather than treating it as 1/3 (one third – a fraction)

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

But if you remember back to school you would do this equation as:

3 1
9 – ( – ÷ – ) + 1
1 3

3 3
= 9 – ( – x – ) + 1
1 1

Remember that when you change a division to a multiply you turn the
fraction upside down. You can no just multiply the numerators and denominators to give:

9
= 9 – ( – ) + 1
1

= 9 – 9 + 1

= 1

Note you will also get the correct result if you followed my hint and used 0.33333333 instead of 1/3

in this case you get

9 – 3 ÷ 0.3333333333 + 1

= 9 – 9 + 1

= 9

(note you need to round it as the 1/3 in decimal is actually 0.333 repeator)

Kumarsays:

Thank you for your explanation. I will try to edit post to simplify explanation.