A scientific calculator is permitted in the GCSE calculator papers. Knowing how to enter fractions, powers, roots, trigonometric values, and standard form correctly saves time and prevents errors. These skills are not tested in isolation, but confident calculator use frees attention for the mathematical reasoning.
Which calculator is recommended for GCSE?
Most UK schools use the Casio fx-83GT CW (or the equivalent fx-85GT CW with solar power). All examples below use the Casio layout. The key principles apply to other models, but button positions and labels may differ. Always check with your teacher that your calculator is approved for your exam board.
How do you enter fractions and mixed numbers?
To enter ¾:
- Press the fraction button (labelled a b/c or a stacked fraction icon).
- Type 3, navigate to the denominator, type 4.
- Press = to compute or use the fraction in a longer calculation.
To enter a mixed number like 2¼:
- Press SHIFT then the fraction button (this activates the mixed-number template on most Casio models).
- Enter 2 in the whole-number box, 1 in the numerator, 4 in the denominator.
To convert a fraction answer to a decimal: press S⟺D (or FORMAT → Decimal on newer models).
How do you calculate powers and roots?
| Key | What it does | Example |
|---|---|---|
| x² | Squares the number | 7 x² → 49 |
| xⁿ or ^ | Raises to any power | 2 ^ 10 → 1024 |
| √ | Square root | √ 144 → 12 |
| SHIFT √ or x^(1/n) | Cube root or nth root | ∛27 → 3 |
| x⁻¹ | Reciprocal (1/x) | 4 x⁻¹ → 0.25 |
Tip: For cube roots on a Casio, press SHIFT then the square root button to get ∛□, then type the number.
For ⁵√32: use the nth root template — press SHIFT then xⁿ (labelled ˣ√□ above the key), type 5, navigate to the radicand, type 32. Answer: 2.
How do you enter trigonometric values?
Make sure your calculator is set to degree mode for GCSE questions (unless the question specifies radians — rare at GCSE). Check: the display should show D (not R or G) in the top corner.
- sin 30° → press sin, type 30, press = → 0.5 ✓
- cos 45° → press cos, type 45, press = → 0.7071…
- tan 60° → press tan, type 60, press = → 1.7320…
Inverse trig (finding an angle):
- sin⁻¹(0.5) → press SHIFT sin, type 0.5, press = → 30° ✓
- On Casio, SHIFT sin is labelled sin⁻¹ above the sin key.
Always check: does your answer make sense as an angle? sin⁻¹ always gives a result between 0° and 90° for a positive value.
How do you enter standard form?
To enter 3.6 × 10⁸:
- Type 3.6.
- Press the ×10ˣ button (labelled EXP or ×10ˣ — do NOT press × and then 1 and 0 separately).
- Type 8.
- The display shows 3.6×10⁸ or 3.6E8.
To enter 2.5 × 10⁻³: follow the same steps, then press the (−) (negative) key before typing 3.
The calculator handles multiplication and division of standard form numbers automatically once you enter them correctly.
How do you use brackets and memory?
Brackets maintain the correct order of operations. For expressions like (3 + 5) ÷ (2 × 4):
- Press (, type 3 + 5, press ), press ÷, press (, type 2 × 4, press ), press =.
- Answer: 1.
Memory stores an intermediate result:
- STO → (or M+, M−): stores the current answer.
- RCL (or M on screen): recalls the stored value.
- Useful when a calculation produces a long decimal that you need to use again.
ANS key: automatically inserts the previous answer. Pressing ANS at the start of a new expression avoids retyping.
Frequently asked questions
How do I switch between degrees and radians?
On Casio fx-83GT CW: press SETTINGS (or SETUP), choose Angle Unit, and select Degree. Look for the D indicator at the top of the display. For GCSE, degrees is almost always correct.
Why does my calculator show a fraction when I want a decimal?
Your calculator is in MathIO (natural display) mode and is showing the exact form. Press S⟺D to toggle between surd/fraction form and decimal. If you need the decimal for a final answer, use this conversion before writing it down.
What should I check before any exam?
Check: (1) degree mode is on; (2) no stored values in memory from a previous session (press AC or MEM CLEAR); (3) battery is charged or solar panel is working; (4) the calculator model is on your exam board's approved list; (5) you know where the fraction, power, root, and ×10ˣ buttons are without searching.
Can I use a calculator app on my phone for GCSE?
No. GCSE exam regulations require a physical, non-programmable scientific calculator. Phones, tablets, and graphical calculators are not permitted. Some schools lend calculators — confirm what is available with your teacher well before the exam.
For GCSE maths support that helps you understand, not just calculate — visit aitutors.me.