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
    A car travels 297 miles and uses 41.3 litres of fuel.

    (a) Work out an estimate for the number of miles the car travels per litre.

    (b) Is your estimate an overestimate or an underestimate? Give a reason.
    Level 5 · 3 marksTry it
  2. 2
    Work out an estimate for the value of 9.122×2.130.485\dfrac{9.12^2 \times 2.13}{0.485}

    You must show your working.
    Level 5 · 3 marksTry it