This course, MathsOne2025, is designed to cover the Senior One Mathematics syllabus for Ugandan secondary schools based on the national Lower Secondary Competency-Based Curriculum. It offers a comprehensive introduction to foundational mathematics topics including number bases, integers, fractions, percentages, algebra, geometry, and data handling. The course emphasizes learner-centered approaches with numerous activities, investigations, and practical applications relevant to everyday life and the learners' environment. Through interactive lessons and regular assessments, students will build strong mathematical skills and problem-solving abilities, preparing them for success in higher secondary education