Top 7 Casio ClassWiz fx-991EX Tricks for GCSE & A-Level Exams

Unlock the Hidden Power of Your Scientific Calculator

The Casio ClassWiz fx-991EX and fx-991CW are permitted in all UK GCSE and A-Level calculator exams. Knowing how to leverage their built-in functions can save over 10 minutes per exam and eliminate algebraic verification errors.

1. Solving Quadratic and Cubic Equations Instantly

Navigate to MENU $\rightarrow$ Equation/Func (A) $\rightarrow$ Polynomial (2).

Input coefficients for $ax^2 + bx + c = 0$. The calculator gives:

• Exact roots (including surds and fractions)
• Complex roots (for Further Maths)
• Coordinates of the minimum or maximum turning point of the parabola

2. Verifying Definite Integrals

Before submitting your Paper 2 script, verify any definite integral using the $\int_a^b$ key. While you must show all analytical working for method marks, the numerical answer confirms whether your substitution was flawless.

3. Table Mode for Graph Sketching

Use MENU $\rightarrow$ Table (9) to generate coordinates for tricky reciprocal or trigonometric functions. This prevents drawing inaccurate curves.