This document discusses different strategies for teaching mathematics, including drill work, homework, oral work, and written work. Drill work involves repetition and practice to build mastery of basic skills and habits. Homework provides opportunities for students to apply and practice what they've learned outside the classroom. Oral work develops mental alertness through verbal problem solving, while written work allows for testing knowledge and minimizing mistakes through writing out problems and solutions. Each strategy has benefits and disadvantages depending on the topic and students' skill levels.