Efficient calculator use saves time and avoids errors. Key skills include entering fractions, powers, roots, and using memory functions correctly.
Essential key knowledge (Casio fx series):
- Fractions: use the $\frac{\square}{\square}$ key; the calculator displays results as fractions automatically
- Powers: use the $x^\square$ key (e.g. $3^5$ → type $3$, $x^\square$, $5$)
- Square roots: $\sqrt{\square}$ key — bracket the whole expression if needed
- Negative numbers: use the $\text{(–)}$ key, not the minus key
- Standard form: use $\times 10^x$ to enter values like $3.2 \times 10^4$
- Brackets: use them to ensure correct order of operations
$$\frac{3.4^2 + 1.8}{2.6 - 0.9} \quad \text{— enter as a single fraction to avoid errors}$$
Always check your answer makes sense. For multi-step calculations, use the ANS key to chain results rather than retyping rounded values.
Common error: entering $-3^2$ and getting $9$ when you meant $(-3)^2 = 9$, or omitting brackets around a denominator.