TI-84 / Graphing Calculator Techniques for H2 Maths Exams
28 Mar 2026, 00:00 Z
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TL;DR
Most JC students know which graphing calculator to buy but not how to use it strategically in exams.
The GC is not just a computation tool - it is an answer-checking tool, a pattern-recognition tool, and a time-saving tool.
This guide covers the techniques that save time and catch errors in H2 Maths papers. For approved models and exam mode setup, see our GC Models and Exam Mode guide.
The GC mastery gap
Discussions on KiasuParents and r/SGExams consistently identify graphing calculator skills as a knowledge gap for H2 Maths students. Students know the basic functions (graphing, solving equations) but miss the strategic techniques that save time and catch errors during exams.
The difference between a student who uses the GC for computation and one who uses it strategically can be 15–20 minutes saved across a 3-hour paper - enough to attempt one additional question.
Technique 1: Answer-checking with graphs
When to use: After solving any equation, inequality, or calculus problem algebraically.
How it works: Graph both sides of an equation (or graph your final answer) and visually verify that the intersections, roots, or areas match your algebraic answer.
Example: You solve an integration problem and get the answer as 3.5 square units.
- Graph the function
- Use the GC's numerical integration feature to compute the definite integral
- If the GC gives 3.5, your algebra is confirmed. If it gives a different value, you have an error to find.
Key point: This is not doing the question twice - it is a 30-second verification that catches sign errors, integration constant mistakes, and wrong limits. The GC check should be automatic after every calculus question.
Technique 2: Radian vs degree mode awareness
The trap: Trigonometry and complex number questions require radian mode. Some questions (particularly those involving bearings or angles in geometry) may use degrees. If the mode is wrong, the GC gives a plausible-looking but completely wrong answer.
The habit to build: Before every question involving trigonometric functions, complex numbers in modulus-argument form, or any angle-related computation, check the MODE setting.
Default for A-Level papers: Radian mode. Unless the question explicitly gives angles in degrees, assume radians.
The dangerous scenario: A complex number question asks for the argument. You compute arctan(1) and get 45 (in degree mode) instead of the correct 0.7854 radians. The answer looks reasonable either way, so you may not catch the error unless you have the mode-checking habit.