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4MA1/2FR Jan 2019, Question 20: Upper and Lower Bounds

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

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The question, in short

A line measures 12.3 cm to 1 decimal place; state the upper and lower bounds of its length.

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

Part (a) · 1 mark

Give the upper bound of the length, given 12.3 cm rounded to 1 decimal place.

  1. 1The measurement is given to 1 decimal place, so the upper bound is found by adding half of 0.1.
  2. 212.3 + 0.05 = 12.35

Answer12.35

Part (b) · 1 mark

Give the lower bound of the length, given 12.3 cm rounded to 1 decimal place.

  1. 1The lower bound is found by subtracting half of 0.1 from the given length.
  2. 212.3 − 0.05 = 12.25

Answer12.25

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