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4MA1/2F Jun 2018, Question 11: Using a Calculator

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks

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The question, in short

Evaluate the expression 10.4/(5.1 − 2.7) + (6.8 − 3.2)/9.5, giving the full calculator display as a decimal, then round it to 3 significant figures.

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Part (a) · 2 marks

Work out 10.4/(5.1 − 2.7) + (6.8 − 3.2)/9.5 as a decimal and write every figure shown on the calculator.

  1. 1First fraction: 5.1 − 2.7 = 2.4, and 10.4 ÷ 2.4 = 4.333333333
  2. 2Second fraction: 6.8 − 3.2 = 3.6, and 3.6 ÷ 9.5 = 0.378947368
  3. 34.333333333 + 0.378947368 = 4.712280702

Answer4.712280702

Part (b) · 1 mark

Round the answer from part (a) to 3 significant figures.

  1. 14.712280702 to 3 significant figures: the figures are 4, 7 and 1
  2. 2The next figure is 2, so round down
  3. 34.712280702 = 4.71 to 3 s.f.

Answer4.71

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