摘要：This paper aims to be a contribution to financial mathematics. In particular, it raises the concept of making partial payments simplified by using the criterion of sum of digits . The formula proposed allows estimating the unknown variables of the model. The usefulness of the model is both academic and practical. It could be part of a software which also enables the calculation of early cancellation of a partial payment credit given in simple interest.
关键词：partial payments;simple interest;sum of digits;financial mathematics;software.;pagos parciales;interés simple;suma de dígitos;matemática financiera;software.
