GCSE Maths (Edexcel)

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Number Measures and accuracy

Using a Calculator

8:14 estimate answers; check calculations using approximation and estimation, including answers obtained using technology
Spec N14
Previous Estimation Next Rounding to Place Value
  • Calculators can save time in exams and are necessary for some questions
  • Key buttons on a calculator include fraction, square root, general root, brackets, square, power of, times 10 to the X, pi, trig functions, and inverse trig functions
  • Calculators may look different and have different functions, so it's important to refer to the manual
  • Equations should be inputted into the calculator exactly as written on the page, with brackets used correctly
  • If the calculator can only carry out one operation at a time, calculations should follow BIDMAS (Brackets, Indices, Division, Multiplication, Addition, Subtraction)
  • Calculated values on a calculator may only display a certain number of decimal places, but the more precise value can be recalled using the ans button
  • An example question is given to demonstrate how to use a calculator to find a solution

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264

questions for Number

39

questions for Measures and accuracy