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
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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
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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
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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
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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
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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
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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.