The session entitled “We use our strategy to estimate” is designed for the fourth grade of Primary Education, it was developed in the area of Mathematics._x000D_ In the preparation of the session, we worked with the pedagogical and didactic processes of the area of mathematics to promote meaningful learning._x000D_ The strategies used were designed to promote the active and meaningful participation of all students._x000D_ It is intended at all times to awaken the interest and motivation of the student in mathematics, since it is a very important and valuable area._x000D_ The Introduction is oriented to class planning, performance to be evaluated, evidence of learning and the assessment instrument to be used._x000D_ In the second part the Theoretical Support is developed where the conceptual definitions of the subject to be discussed are exposed, in order to explain in a simple way an...