Baste Nesse Buanes created MATH-835:
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             Summary: Fraction percentageValue rare overflow
                 Key: MATH-835
                 URL: https://issues.apache.org/jira/browse/MATH-835
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.0
            Reporter: Baste Nesse Buanes
            Priority: Minor


The percentageValue() method of the Fraction class works by first multiplying 
the Fraction by 100, then converting the Fraction to a double. This causes 
overflows when the numerator is greater than Integer.MAX_VALUE/100, even when 
the value of the fraction is far below this value.

The patch changes the method to first convert to a double value, and then 
multiply this value by 100 - the result should be the same, but with less 
overflows. An addition to the test is also included.

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