One of the strategies that I use most is group work, students like to share ideas and develop tasks in classes with their classmates. I also like to ask those faster students to do their homework that are guardians of those who require help, that way they feel useful in the classroom and can use their remaining time in helping others.
Another thing that I like to do a lot is to ask other teachers to be able to do work in sets where students must integrate different skills, both in mathematics with science, mathematics with arts, mathematics with language, etc. It is a concrete way to show students that mathematics serve in everyday life and that they are not just a set of abstract ideas.
I learn that my students are capable of helping each other, that they are supportive of each other, that they have different learning rhythms and that I must give everyone space to shine. I learn that I can work with my colleagues and show students how to do collaborative work. I learn that mathematics is not only taught through numerical expressions, but can be through art, literature, science, music, etc.