Based on the qspray package, this package introduces the new type ratioOfQsprays'. An object of type qspray represents a multivariate polynomial with rational coefficients while an object of type ratioOfQsprays', defined by two qspray objects, represents a fraction of two multivariate polynomials with rational coefficients. Arithmetic operations for these objects are available, and they always return irreducible fractions. Other features include: differentiation, evaluation, conversion to a function, and fine control of the way to print a ratioOfQsprays object. The C++ library CGAL is used to make the fractions irreducible.