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Using A Calculator

플레이하며 배우기

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선생님을 위해: Using A Calculator(Maths [CIE], Extended)을(를) 위한 바로 쓸 수 있는 수업 슬라이드, 복습 노트 — 수업에 사용하거나, 학생들이 실시간 게임으로 즐기는 인터랙티브 클래스 활동으로 진행하세요.

수업 노트

Calculator Basics

  • Use a scientific calculator; know its specific functions (e.g., Casio fx-83GT).
  • Reset your calculator before an exam to ensure correct settings.
  • Default to MATH mode (display shows 'MATH').
  • Set angle unit to degrees (display shows 'D').
  • Use 'S⇔D' button to switch between exact (fraction) and approximate (decimal) answers.
  • Press 'SHIFT' to access secondary functions (e.g., cube root, inverse trig).

The Casio fx-83GTX Classwiz

The Casio fx-83GTX Classwiz

Using Brackets Correctly

  • Use brackets as in written mathematics to avoid order-of-operations errors.
  • Put brackets around negative numbers: e.g., `(-3)²` not `-3²`.
  • Use the '(-)' button for negative values, not the minus sign.
  • Always close brackets after functions like sin(45°).

Trigonometry Functions

  • Use sin, cos, tan for missing sides; ensure degrees mode.
  • Use sin⁻¹, cos⁻¹, tan⁻¹ (via SHIFT) for missing angles.
  • Type angle inside brackets: e.g., `sin(57)`.
  • For older calculators, you may need to enter angle first then press function.

Standard Form and π

  • Use ×10ˣ button (or 'EXP') to enter standard form: e.g., `1.2×10⁻³`.
  • Modern calculators display as `1.2×10⁻³`; older models may show `1.2E-3`.
  • Access π via SHIFT button (often near standard form).

The Ans (Answer) Function

  • Press 'Ans' to recall the last calculated result.
  • Use Ans to avoid rounding intermediate decimals in multi-step problems.
  • Example: after computing 4.69, press Ans to use it in next calculation.

Table Function

  • Use TABLE mode to generate values for functions like y = x³ – 6x + 1.
  • Enter the function, then specify start, end, and step values.
  • Helps reduce errors in 'complete the table' questions.

Time Calculations

  • Enter time using ° ' '' button (degrees/minutes/seconds).
  • Example: 3 min 45 sec = `0°3'45''`.
  • Press the same button to convert between decimal and HMS formats.

Worked Example Tips

  • Do one calculation at a time and write down each step.
  • Write down more digits than needed in working; round only final answer.
  • Use fraction button for division, square root and cube buttons as needed.
  • For multi-step, type whole expression in one go using brackets.

슬라이드

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연습 문제

무료 미리 보기 — 55개 중 8개 문제. 가입하면 전부 볼 수 있어요.

  1. 1.Calculate 4 / 0.0025.

    Easy
    • A1600
    • B160
    • C0.000625
    • D0.00625

  2. 2.Calculate 5/8 + 3/4.

    Easy
    • A1.375
    • B1.25
    • C1.5
    • D1.625

  3. 3.Calculate 5.39 − 0.98.

    Easy
    • A4.41
    • B4.31
    • C4.51
    • D5.31

  4. 4.What is the value of 2.38 + 6.42?

    Easy
    • A8.8
    • B8.7
    • C8.9
    • D7.8

  5. 5.Calculate 0.743 − 0.0743.

    Easy
    • A0.6687
    • B0.669
    • C0.668

  6. 6.Calculate 38.5 × 14.2 ÷ (18.4 − 5.9). Write down all the figures on your calculator display.

    Medium
    • A43.736
    • B43.74
    • C546.7
    • D43.836

  7. 7.Round the answer 43.736 to 1 significant figure.

    Easy
    • A40
    • B44
    • C44.4
    • D50

  8. 8.Calculate (16.379 − 0.879) / (4.2 × 1.241). Give your answer correct to 2 significant figures.

    Medium
    • A3.0
    • B2.9
    • C3.1

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