Tip 1: Display mathematical role models around the classroom from a multitude of cultural backgrounds. This may be tough, since most modern Mathematics was handled by rich white men in Europe. However, I think there’s still plenty of people to decorate with.
Tip 2: Do home visits. Home visits can be a strategic mess, but it does wonders for developing relationships and understanding where your students come from.
Bonus Tip: Use the cultures in your classroom. Ask students how to say words in their native language. Make sure that ESL students feel like they have language skills and are acquiring English rather than lacking English skills. Think of the assets your students bring, not the deficits. Language is an asset, and students should not feel inferior for knowing languages other than English.