Level: Secondary. Let´s Explore! Maths 4 is part of a five-level series for secondary school built on the basis of a balanced progression of mathematical thinking in alignment with the Singapore Maths method and other international standards. The Let´s Explore! Maths series is designed to ensure a deep understanding of mathematical concepts and skills, and to prepare students for success in various internationally recognised examinations. The series teaches mathematics systematically, meets the requirements of the Singapore Maths Curriculum and helps students reach a level of mathematics awareness that facilitates their capabilities in everyday activities.