Unlock hidden workflows on your scientific calculator. Learn how to verify quadratic solutions, solve simultaneous equations, and calculate standard deviations instantly.
Your scientific calculator is a powerful computer, yet 90% of students only use it for basic arithmetic, fractions, and trigonometry ratios. If you are using the standard **Casio ClassWiz (fx-991EX or fx-85GTX)**, you have access to tools that can save you precious minutes and catch algebra errors.
Here are the top three calculator shortcuts every candidate should master:
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1. Quadratic Equation Solver (Equation/Func Mode)
Did you know your calculator can solve $ax^2 + bx + c = 0$ equations directly?
* Press **MENU**, then navigate to **Equation/Func** (usually option 9 or A).
* Select **Polynomial** (Option 2), and set the degree to **2**.
* Input your $a$, $b$, and $c$ coefficients.
* Press **=** to get the exact roots ($x_1$ and $x_2$), as well as the coordinates of the turning point (vertex) of the curve!
* *Note: You must still show your factorisation or formula steps on paper to get method marks, but this lets you check your final answers instantly.*
2. Table Mode for Graph Plotting
Plotting cubic or reciprocal graphs can be slow and error-prone. Use Table Mode to generate coordinates:
* Press **MENU**, then select **Table** (Option 9 or 3).
* Input your function, e.g., $f(x) = x^3 - 2x + 1$.
* Set your **Start** (e.g. -3), **End** (e.g. 3), and **Step** (e.g. 1).
* The calculator will generate a clean table of coordinates. Copy these coordinate coordinates onto your graph sheet for a perfect curve.
3. Verify Ratios & Prime Factors (FACT Button)
If you need to simplify a fraction or find prime factors:
* Enter the number (e.g. 360) and press **=**.
* Press **SHIFT**, then press the **FACT** button (usually above the degrees/minutes key).
* The screen will instantly show the prime factorisation: $2^3 \times 3^2 \times 5$. This is incredibly useful for finding Highest Common Factors (HCF) and Lowest Common Multiples (LCM).