We examined the presence of mathematical processes in textbooks for preschool education in Chile and Spain. For this purpose, a content analysis of the mathematical tasks of: numbers, geometry, measurement, algebra, statistics and probability has been carried out. The results show a predominance of problem solving and representation processes. The mathematical processes less present are: communication and reasoning and proof. On the other hand, the transcendental role of the teacher's didactic guide is observed in offering suggestions for the management of tasks aimed at offering learning opportunities linked to mathematical processes.