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Flashcards · Maths · Calculator Skills

Using Your Calculator

16 cards

  1. What mode must a calculator be in for GCSE trigonometry?

    Degrees.

  2. Which key enters a number such as \(3.2 \times 10^5\)?

    The EXP key.

  3. Which key do you use for a negative number?

    The negative key, not the subtract key.

  4. Why must you use brackets for a fraction?

    So that the top and the bottom are each worked out first.

  5. What does the Ans key do?

    Recalls the last answer.

  6. When should you round your answer?

    Only at the end.

  7. How do you find an angle from a ratio?

    Use SHIFT and sin, cos or tan.

  8. What is \(1500 \times 1.03^4\) to the nearest penny?

    \(\pounds 1688.26\).

  9. What does \(\tan^{-1}\) do?

    Gives the angle that has a given tangent.

  10. How do you work out \(\sqrt{8.4^2 + 5.1^2}\)?

    Put the whole sum inside the root, with brackets.

  11. What should you write down for method marks?

    The calculation that you entered.

  12. How do you check a calculator answer?

    Make a quick estimate first.

  13. What is the first thing to check on your calculator?

    That it is in degree mode.

  14. Do all calculators use the same key labels?

    No, so learn the keys on yours.

  15. Why should you not round halfway through?

    Rounding early makes the final answer less accurate.

  16. What accuracy should the final answer have?

    The accuracy that the question asks for.