GCSE · Rounding & bounds

Rounding and significant figuresExam-style questions

Why significant figures count information rather than decimal places, why the count starts at the first non-zero digit, and why place value must survive the rounding.

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16 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    Round 38623862 to 1 significant figure.
    Level 1 · 1 markTry it
  2. 2
    Round 0.04720.0472 to 2 significant figures.
    Level 1 · 1 markTry it
  3. 3
    (a) Round 0.0047180.004718 to 2 significant figures. (1 mark)

    (b) Round 0.0047180.004718 to 3 decimal places. (1 mark)
    Level 1 · 2 marksTry it
  4. 4
    Use your calculator to work out

    19.6+2.738.4−3.15\dfrac{\sqrt{19.6} + 2.7^3}{8.4 - 3.15}
    (a) Write down all the figures on your calculator display. (1 mark)
    (b) Write your answer to part (a) correct to 3 significant figures. (1 mark)
    Level 1 · 2 marksTry it
  5. 5
    (a) Write 3.141593.14159 correct to 3 significant figures. [1]

    (b) Write 0.067490.06749 correct to 2 significant figures. [1]
    Level 1 · 2 marksTry it

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