Great question! For most high school math and science, look for a scientific calculator that’s easy to read and covers core functions.

• Display: Two- or multi-line screens help you see inputs and results at once.
• Functions: Fractions, scientific notation, trig/logs, exponents, roots, and basic statistics (mean, standard deviation).
• Modes: Quick toggles for degrees/radians and number formats.
• Power: Solar or long-lasting battery, depending on your classroom lighting.
• Build: Durable keys and a protective cover for backpack travel.

Some advanced classes may appreciate extras like equation solving or complex numbers. It’s best to check your teacher’s syllabus and any exam rules. You can use the filters on our category page to compare display type, power source, and function count. Pickup and delivery options may vary by location—check availability at checkout.

Both can work well—it depends on your lighting and preference.

• Solar/dual-power: Handy in well-lit classrooms and reduces battery swaps, but screens may dim in low light.
• Battery-only: Consistent brightness in dim lecture halls; you’ll just replace batteries periodically.
• Battery type: AAA cells are easy to replace; coin cells are compact and typically last a long time.
• Tip for tests: Fresh batteries can help minimize distractions; policies may vary.

You can find the power source and battery type on each product page. Choosing based on your typical classroom lighting can make day-to-day use smoother. Extra batteries and school supplies are available online and in stores, with pickup or delivery options that may vary by area.

Exam rules differ, so it’s smart to confirm with your teacher or the test organizer first. That said, here’s a general guide:

• Commonly allowed: Non-graphing scientific calculators without computer algebra systems (CAS) or advanced programmability.
• Often restricted: Models with graphing, text storage, or wireless features.
• Before test day: Clear memory if your model supports it, set the correct angle mode, and practice the functions you’ll need.

Always verify against the specific policy for your exam or classroom. On our product pages, review feature lists to match what’s allowed. If you need to swap models, check the return policy shown on the item page. Availability of pickup and delivery can vary by store and region.

The exact buttons vary by model, but these steps can help:

1. Press Mode or Setup to find the angle setting (labels may differ).
2. Select DEG for degrees or RAD for radians, then confirm (often with Enter or =).
3. Look for a screen indicator like DEG or RAD.
4. Quick check: sin(90) should be about 1 in degrees. In radians, sin(π) should be about 0 (rounding may vary).

If your buttons are labeled differently (e.g., a dedicated DRG key or a Shift function), consult the user guide that came with your calculator or the product page for model details. Switching back is usually the same process in reverse.

Gentle cleaning can help restore key feel without damaging your device.

1. Power off and remove batteries (if removable). Avoid pressing keys while powered.
2. Wipe the surface with a soft, lint-free cloth slightly dampened with water or 70% isopropyl alcohol. Don’t spray liquid directly.
3. Use a cotton swab around keys; keep moisture out of gaps, the display, and any solar panel.
4. Let it air-dry completely before reinstalling power.

Avoid: Submerging the calculator, abrasive pads, or strong solvents. If keys remain unresponsive, check your user guide for a soft reset option. Cases and cloths are available online and in stores, with pickup or delivery that may vary by location.