Here are a few options for a helpful text, depending on where you intend to post or send this (e.g., a forum, a chat response, or a website).
Si el colegio utiliza este sistema, los alumnos y padres suelen tener un código de acceso para descargar o visualizar el libro digital completo.
If you are preparing an essay, here is a structured approach based on the Santillana curriculum: Introduction
Searching for often leads students and parents to look for digital resources to support their learning in the third year of primary school.