GCSE · Rounding & bounds

EstimationExam-style questions

Why estimating means rounding everything to 1 significant figure BEFORE calculating, how to divide by decimals cleanly, and how to reason about whether an estimate is an over- or underestimate.

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

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    Estimate the value of 48×2148 \times 21
    Level 1 · 2 marksTry it
  2. 2
    Estimate the value of 6122.9\dfrac{612}{2.9}
    Level 1 · 2 marksTry it
  3. 3
    Work out an estimate for 4.9×20.30.51\dfrac{4.9 \times 20.3}{0.51}

    You must show your working. (2 marks)
    Level 1 · 2 marksTry it
  4. 4
    Work out an estimate for 7.9×3.220.48\dfrac{7.9 \times 3.2^2}{0.48}

    You must show your working. [3]
    Level 2 · 3 marksTry it
  5. 5
    Work out an estimate for the value of 48.6×21.29.7\dfrac{48.6 \times 21.2}{9.7}

    You must show your working.
    Level 3 · 3 marksTry it

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