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Think! Mathematics Secondary Textbook 3A (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. Quadratic and Fractional Equations 
  • Solving quadratic equations by completing the square
  • Solving quadratic equations using formula
  • Solving fractional equations reducible to quadratic equations
  • Solving quadratic equations by graphical method
  • Sketching graphs of quadratic functions
  • Applications of quadratic equations and functions in real-world contexts
  1. Simultaneous Linear Inequalities
  • Solving simultaneous linear inequalities
  • Solving problems involving simultaneous linear inequalities
  1. Indices and Standard Form
  • Laws of Indices
  • Zero and negative indices
  • Rational indices
  • Compound interest
  • Standard form 
  1. Coordinate Geometry
  • Length of a line segment
  • Gradient of a straight line
  • Equation of a straight line
  1. Graphs of Functions and Graphical Solution
  • Graphs of cubic functions
  • Graphs of reciprocal functions
  • Graphs of exponential functions
  • Gradient of a curve
  • Applications of graphs in real-world contexts

Complete series contain:

  1. Textbook
  2. Workbook