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# Simplify fractions , Mathematica

Posted on 2013-01-10
Medium Priority
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Hello,

How can Simplify fraction  in Mathematica

for example this large number

``````31563960367552936108301021855171511091869192865677121/
157819801837764680385589599609375000000000000000000000
``````
is
`````` 0.2
``````

but when i try in Mathematica

``````31563960367552936108301021855171511091869192865677121 /
157819801837764680385589599609375000000000000000000000
``````

i don't get 0.2 it shows just the same numbers :(

Thank you
0
Question by:kensy11
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LVL 32

Expert Comment

ID: 38765503
I plugged your numbers in and got about 0.2:They show you the exact result as a fraction since to get an exact decimal representation would take too many places to show (or it may be a repeating decimal).
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LVL 32

Expert Comment

ID: 38765519
Your OP that says that the answer is 0.2 cannot be true since 0.2 is 1/5.
If you multiply the numerator by 5, then you should get exactly the denominator if the answer is 0.2. But that cannot be since 5*(...7121) ends in a 5. For 0.2 to be the answer, you would expect that the multiplication would end in many 0's.
0

Author Comment

ID: 38765624
phoffric   How did you do it ?? did you use Mathematica program or on the web ?

im using Mathematica 8.0

And as it been shown in your image i get the second step , (the same numbers ) i don't know how to get the decimal approximation as in your image
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LVL 32

Accepted Solution

phoffric earned 2000 total points
ID: 38765691
On the web:
http://www.wolframalpha.com/input/?i=31563960367552936108301021855171511091869192865677121+%2F+157819801837764680385589599609375000000000000000000000

This link Exact and Approximate Results shows how to get the results you want. This is for version 9, but I would not expect major changes in this area.
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