Educative program to practice fractions

 JFractionLab is a nice tool for math students that are learning the use
 and operation of fractions.
 .
 It provides a collection of nice exercices with a numeric and visual
 representation of the fractions.
 .
 JFractionLab shows the user every step of the calculation and therefore
 helps him to understand them.
 .
 It gives the user an answer after each input, making impossible to have
 a false answer.