Guide for parents

E-Math vs A-Math: what's the difference?

By T-Leng, T-Leng Tuition · Checked against MOE and SEAB on 12 October 2026

In short

E-Math (Mathematics) is compulsory for every student. A-Math (Additional Mathematics) is an extra subject chosen for Sec 3 and 4.
A-Math is more abstract: algebra, trigonometry and calculus. It assumes everything in G3 E-Math.
Both are two papers of 2 h 15 min and 90 marks at G3.
The A-Level H2 Maths syllabus assumes A-Math knowledge, so A-Math matters for students who may take H2 Maths in JC.

The names

On the timetable and the certificate the subjects are Mathematics and Additional Mathematics. "E-Math" (from Elementary Mathematics) and "A-Math" are what everyone calls them. A-Math is offered at G3 (SEC syllabus K341, O-Level 4049 up to 2026) and at G2 (SEC syllabus K232, N(A)-Level 4051 up to 2026).

What each one covers

	E-Math (G3, K310)	A-Math (G3, K341)
Algebra	Numbers, ratio, percentage, rate and speed, algebraic expressions, functions and graphs, equations and inequalities, sets, matrices	Quadratic functions, equations and inequalities, surds, polynomials and partial fractions, binomial expansions, exponential and logarithmic functions
Geometry	Angles and polygons, congruence and similarity, circle properties, Pythagoras' theorem and trigonometry, mensuration, coordinate geometry, vectors	Trigonometric functions, identities and equations, coordinate geometry, proofs in plane geometry
Statistics and calculus	Data handling and analysis, probability	Differentiation and integration

E-Math is mostly about using maths in context: money, rates, mensuration, statistics. A-Math is mostly algebra, with longer chains of working and more proofs. The SEAB A-Math syllabus says knowledge of G3 Mathematics is assumed.

Some topics overlap, such as quadratics, coordinate geometry and trigonometry, so the two subjects support each other.

The exam papers

	E-Math (G3)	A-Math (G3)
Paper 1	2 h 15 min, 90 marks: about 26 short questions	2 h 15 min, 90 marks: 12 to 14 questions, up to 10 marks each
Paper 2	2 h 15 min, 90 marks: 9 to 10 questions, the last one a real-world problem	2 h 15 min, 90 marks: 9 to 11 questions, up to 12 marks each
Calculator	Allowed in both papers	Allowed in both papers
Formulas given	Mensuration, trigonometry, statistics, compound interest	Quadratic formula, binomial expansion, trigonometric identities, sine and cosine rules

See the full lists: E-Math formula sheet and A-Math formula sheet.

Who takes A-Math

Students choose their upper secondary subjects near the end of Sec 2. Each school sets its own criteria for A-Math, usually a minimum Sec 2 Maths result, and A-Math is often part of the science-heavy subject combinations.

From T-Leng's teaching: the best sign a student will cope with A-Math is how fluent their Sec 2 algebra is: expanding, factorising, algebraic fractions and solving quadratic equations. A student who is slow or unsure with these will find A-Math hard from the first chapter. A student who is solid in these usually copes, even without top marks in Sec 2.

Why it matters after Sec 4

The A-Level H2 Mathematics syllabus assumes knowledge of O-Level Additional Mathematics, and lists those topics in an appendix. Junior colleges generally advise students without A-Math to take H1 Mathematics instead, or to learn the A-Math topics on their own first.

For polytechnic courses, requirements vary by course: check the course's entry requirements.

Getting ready for A-Math

Get ready for Sec 3 A-Math: a free 6-week holiday plan
A-Math notes, every chapter with worked examples
A-Math practice papers with worked solutions

Sources

Schools set their own lower secondary exams and subject criteria; check the details with your child's school.

Free practice at your child's level

Notes for every chapter, and practice that shows where an answer went wrong, step by step.

Read the notes Start free

In short

E-Math (Mathematics) is compulsory for every student. A-Math (Additional Mathematics) is an extra subject chosen for Sec 3 and 4.

A-Math is more abstract: algebra, trigonometry and calculus. It assumes everything in G3 E-Math.

Both are two papers of 2 h 15 min and 90 marks at G3.

The A-Level H2 Maths syllabus assumes A-Math knowledge, so A-Math matters for students who may take H2 Maths in JC.