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practicalities & mapsMETRIC CONVERSIONSExact conversions1 metre = 100 centimetres 1 mile = 1.6093 kilometres 1 square inch = 6.4516 square centimetres1 decimetre = 10 centimetres 1 kilometre = 0.621 mile 1 square foot = 9.2903 square decimetres1 kilometre = 1000 metres 1 inch = 2.54 centimetres1 foot = 30.48 centimetres1 yard = 0.9143 metresEasy conversionDistanceConversion Method ExampleMiles to kilometres (km) add 60% 1 mile + 60% = 1.6 kmKilometres to miles multiply by 60% 1 km x 60% = 0.6 milesInches to centimetres a) multiply by 2.5 4 in x 2 = 8, 20% x 8 = 1.6,b) multiply by 2, add 20% 8 + 1.6 = 9.6 cmCentimetres to inches a) divide by 2.5 10 cm / 2 = 5, 20% of 5 =b) divide by 2, subtract 20% 1, 5 - 1 = 4 inchesFeet to metres divide by 3Metres to feet multiply by 3Yards to metres essentially the same (i.e. 1 yd = approx. 1 m)Metres to Yardsessentially the same (i.e. 1 m = approx. 1 yd)volumeConversion Method ExampleQuarts to litres1 qt is slightly less than 1 litreLitres to quarts1 litre is slightly more than 1 qtPints to litres divide by 2 1 pint / 2 = 0.5 litresLitres to pints multiply by 2 1 litre x 2 = 2 pints900 cubic feet = approx. 30 cubic metres = approx. 30 cubic yardsSurface area10 square feet = approx. 1 square metre = approx. 1 square yardtemperatureConversion Method ExampleFahrenheit to Celsius subtract 30, divide by 2 80°F - 30 = 50, 50 / 2 = 25°CCelsius to Fahrenheit multiply by 2, add 30 25°C x 2 = 50, 50 + 30 = 80°F165