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

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

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The question, in short

Calculate a cube root of 421.875, evaluate 7.61² ÷ (5.2 × 3.5) showing full calculator display, then round that result to 2 significant figures.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Find the cube root of 421.875.

  1. 17.5 × 7.5 × 7.5 = 421.875
  2. 2So the cube root of 421.875 is 7.5

Answer7.5

Part (bi) · 2 marks

Work out 7.61² divided by (5.2 × 3.5) and record every digit shown on the calculator.

  1. 1Top: 7.61² = 57.9121
  2. 2Bottom: 5.2 × 3.5 = 18.2
  3. 357.9121 ÷ 18.2 = 3.181983516

Answer3.181983516

Part (bii) · 1 mark

Round the answer from part (b)(i) to 2 significant figures.

  1. 1The first two significant figures of 3.181983516 are 3 and 1
  2. 2The next figure is 8, so round up: 3.2

Answer3.2

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