Mate + is a project for the teaching of mathematics of Santillana Educación S. L. It allows students to create their own problem-solving strategies through games and experimentation. This is fun math, based on decomposing numbers. The contents are presented connected with the reality of the students: the house, the school and the neighborhood. The project is organized from 4 content blocks: numbers, problem solving, positions and geometry and measurement. The Mate + app offers resources and acti