LaTeX & Mathematical Communication for the IB Maths IA
The IB Internal Assessment is marked against a Communication criterion worth 4 of the 20 marks. Handwritten scrawl, ambiguous notation, and inconsistent variable names are the fastest ways to lose them — and the fastest fix is a working knowledge of LaTeX (or the LaTeX-flavoured equation editor built into Google Docs / Word).
Why it matters
- Communication and Mathematical Presentation together are worth 4 / 20 IA marks — 20% of the whole score. Most students give up half of those without noticing.
- Every IB examiner has read the same LaTeX-typeset equations in every textbook they own. Handwritten fractions look wrong to them. Typed x² + 2x + 1 looks amateurish. LaTeX x^2 + 2x + 1 looks correct.
- It takes about 90 minutes to learn the LaTeX you'll ever need for an IA — and it's a skill you'll keep for undergraduate maths, physics, economics, and engineering.
Examiner signals
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Notation consistencyPick one symbol per quantity and stick with it. If you defined the population as P(t) in section 1, don't switch to N(t) in section 3. Examiners track this.
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Formula booklet quotationsWhen you use a booklet formula, quote it: “using V = P ert (formula booklet SL 1.4)”. Small effort, easy Communication mark.
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Diagram + labelsEvery graph must have axes labelled, units stated, and a caption sentence beneath (“Figure 2. Population growth 2020-2035 predicted by the exponential model.”). Missing captions kill Presentation marks.
Interactive fluency practice for LaTeX & Mathematical Communication for the IB Maths IA
A dedicated fluency-first practice set for this skill — thoughtful questions, instant feedback, and worked solutions that build understanding rather than reflexes — is queued up next. Drop your email to be the first to know when it goes live (no spam, one email when it's ready).
FAQ
Do I have to write my IB IA in LaTeX?
No — you can use Google Docs, Word, Pages, or even hand-write it (though examiners now overwhelmingly recommend typed submissions). But your equations should be typeset. Google Docs has a native LaTeX-flavoured equation editor (Insert → Equation) which is enough for 90% of IAs.
What are the essential LaTeX commands for an IB IA?
You need: fractions \frac{a}{b}, powers x^2, subscripts x_1, integrals \int_0^1, summations \sum_{n=1}^N, Greek letters \pi \theta \mu \sigma, and inline vs display maths ($ … $ vs $$ … $$). That covers essentially every IA.
How much does communication actually count in the IB Maths IA?
Communication is criterion A (4 marks) and Mathematical presentation is criterion B (4 marks). Together that's 8 / 20 — nearly half your IA mark. Consistent notation, quoted formulae, labelled diagrams, and a table of contents will alone score full marks on both.