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   Excel can be used just not for calendars or planners.  It also comes into play   
when used as math tools.  

     Halloween Holiday Math: (3X-2)(X-1)(5X+3)

     Summer Holiday Math: 3X^2-5X*2=(3X-2)(X-1)

     New Year's Math: Completing the Square for Quadratic Equation

     Early Summer Math: Linear Equation and Quadratic Equation

     Perpendicular Distance from a Point to a Line

     Early Summer Math II: Circle Equation and Linear Equation