Study notes

Singapore O-Level syllabus, Secondary 1 to 4

Study notes

Notes for the Singapore O-Level syllabus, written to be read after a wrong answer rather than cover to cover. Every section has worked examples with full solutions and a practice question you can try without an account.

9 chapters published, 74 sections in total. Free to read, no account needed.

Secondary 1

9 chapters
  • 1Primes, HCF and LCM
    • Classify whole numbers as prime or composite using trial division
    • Express a composite number as a product of its prime factors using index notation
    • Find the square root of a perfect square and the cube root of a perfect cube using prime factorisation

    11 sections

  • 2Integers, Rational Numbers and Real Numbers
    • Understand negative numbers and their real-world applications
    • Order and compare integers, fractions and decimals on a number line
    • Perform addition and subtraction of integers

    8 sections

  • 3Approximation and Estimation
    • Understand the difference between approximation and estimation
    • Round off numbers to a given number of decimal places
    • Identify significant figures using the 5 rules

    7 sections

  • 4Basic Algebra and Algebraic Manipulation
    • Use letters to represent unknown numbers, generalised numbers and variables
    • Evaluate algebraic expressions by substituting given values
    • Add and subtract linear expressions by combining like terms

    8 sections

  • 5Linear Equations
    • Recognise a linear equation in one variable, and know what it means to solve one
    • Solve linear equations in one variable, including ones whose coefficients are fractions
    • Solve simple fractional equations that reduce to linear equations

    7 sections

  • 6Linear Functions and Graphs
    • Use the Cartesian coordinate system to locate and plot points on a plane
    • Understand a function as a rule that maps each input to exactly one output
    • Evaluate a function given a specific input value

    9 sections

  • 7Number Patterns
    • Recognise patterns in number sequences (arithmetic, geometric, and others)
    • Find the next terms of a number sequence by identifying the rule
    • Use the general term to find specific terms of a sequence

    6 sections

  • 8Percentage
    • Convert between percentages, fractions and decimals
    • Work with percentages greater than 100% and less than 1%
    • Find the percentage of a given quantity

    10 sections

  • 9Ratio and Rate
    • Simplify ratios and find equivalent ratios
    • Divide a quantity in a given ratio
    • Solve problems involving ratios of two and three quantities

    8 sections

More chapters are being written. Every topic from Secondary 1 to 4 is already practisable, whether or not its notes are published yet.