Changing between metric and imperial units

Understanding measures

Shape

Use and change between Metric / Imperial units:- know 1 inch ≈ 2.5 cm, 1 foot ≈ 30 cm, 3¼ feet ≈ 1 metre, 5 miles ≈ 8 km, 2¼ lb ≈ 1 kg, 1¼ pints ≈ 1 litre, 1 gallons ≈ 4.5 litres
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