//Add method
    public Rational add(Rational passedIn)
    {
        int addedNum, newDen, multiplier;
        Rational addedRat = null;

        if(this.den == passedIn.den)
        {
            addedNum = this.num + passedIn.num;
            newDen = this.den;
        }//end for
        else
        {
            newDen = this.den * passedIn.den;
            addedNum = (this.num * passedIn.den) + (this.den * passedIn.num);
        }//end else


        addedRat = new Rational(addedNum, newDen);

        reduce();

        return addedRat;
    }//end add