public Fraction Divide(Fraction rightFrac)
 {
     return(new Fraction((this.Numerator * rightFrac.Denominator), (rightFrac.Numerator * this.Denominator)));
 }
 public Fraction Subtract(Fraction rightFrac)
 {
     return(new Fraction(((this.Numerator * rightFrac.Denominator) - (rightFrac.Numerator * this.Denominator)),
                         (this.Denominator * rightFrac.Denominator)));
 }