Our prices are denominated in USD.

We ship internationally!

Think! Mathematics Secondary Textbook 3B (8th Ed)


think! Mathematics is a series of textbooks designed to provide students valuable learning experiences and a deeper appreciation of mathematics by engaging their minds and hearts. The series covers the MOE Syllabus for Mathematics implemented from 2020, and reflects the  important shifts towards the development of 21st century competencies. Underpinning the writing of this textbook is our belief that all students can learn and appreciate mathematics.  This textbook series will be a meaningful companion for students as they embark on an exciting journey in secondary school mathematics through collaborative and self-directed learning.

Special features

  • Chapter Opener and Introductory Problem motivate the development of concepts
  • Investigation, Class Discussion, Thinking time, Journal Writing and Performance Task highlight mathematics as a tool and as a discipline 
  • Real-life examples, applications and Problems in Real-World Contexts emphasise the relevance and beauty of mathematics
  • Worked Examples, Practise Now and Exercise questions ensure a high baseline of mastery
  • Challenge Yourself problems provide extension opportunities
  • Reflection prompts encourage metacognition
  • ICT tools promote visualisation and exploration of concepts
  • Invitation to Code and Opportunities to code expose students to this increasingly prominent skill of the future
  • Looking Back and Summary consolidate the big ideas, concepts and knowledge encountered in each chapter


  1. Further Trigonometry
  • Sine and cosine of obtuse angles
  • Area of a triangle
  • Sine Rule
  • Cosine Rule
  1. Applications of Trigonometry
  • Angles of elevation and depression
  • Bearings
  • Three-dimensional problems
  1. Arc Length, Area of Sector and Radian Measure
  • Arc Length
  • Area of a sector
  • Radian measure
  • Arc length and rea of a sector using radian measure
  1. Congruence and Similarity Tests
  • Bisectors and scale drawings
  • Congruence Tests
  • Similarity Tests
  • Applications of congruent and similar triangles
  1. Area and Volume of Similar Figures and Solids
  • Area of similar figures
  • Volume of similar solids
  • Solving problems involving similar solids
  1. Geometrical Properties of Circles
  • Symmetric properties of circles
  • Angle properties of circles

Complete series contain:

  1. Textbook
  2. Workbook