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Conversion Problems (Imperial to and from Metric) (F)
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Conversion Problems (Imperial to and from Metric) (F)

Convert between metric and imperial units for GCSE Foundation. Use key ratios, unit fractions, and sensible rounding to solve real problems in travel, cooking, and sport.

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Fascinating Fact:

In luggage checks, 1 kilogram = 2.205 pounds, so 20 kg ≈ 44 lb. Convert quickly to avoid airline weight surprises.

In GCSE Maths (Foundation), you’ll convert imperial and metric units using conversion factors. Work with ratios, unit fractions (like 1 kg → 2.205 lb), and round answers sensibly for context.

  • Conversion factor: A fixed ratio linking two units (e.g., 1 inch = 2.54 cm).
  • Unit fraction method: Convert using “per one” amounts, then scale up or down.
  • Significant figures: Digits that show precision. Round to match the data given.
What are the most common metric to imperial conversions for GCSE?

Useful ones include 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609 km, 1 kg = 2.205 lb, and 1 litre = 1.76 pints (UK).

How do I convert miles to kilometres quickly?

Multiply miles by 1.609 to get kilometres. For a quick estimate, use 1.6 (so 50 miles ≈ 80 km).

Should I round to significant figures or decimal places?

Match the context: use significant figures for measurements (e.g., 2 s.f.) and decimal places for money or where the question specifies.

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Author:  Frank Evans (Specialist 11 Plus Teacher and Tutor)

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