Understand and use approximate equivalences between metric units and common imperial units.
1 inch ≈ 2.5 centimetres
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Inches - questions requiring the ability to make rough conversions between centimetres and inches.
Pounds - questions requiring the ability to make rough conversions between units of weight.
Pints - questions requiring the ability to make rough conversions between units of capacity.
Miles - questions requiring the ability to make rough conversions between miles and kilometers.
Mixed - questions requiring the ability to estimate the best measures and units.
Imperial Units - Learn about common imperial units and how they relate to other units of measurement.
More on this topic including lesson Starters, visual aids, investigations and self-marking exercises.
See the National Curriculum page for links to related online activities and resources.
1 mile = 1.6 km
1 metre = 39.37 inches
1 foot = 30.5 cm
1 inch = 2.54 cm
1 kg = 2.2 lb
1 gallon = 4.5 litres
1 litre = 1.75 pints
1 tonne = 1000 kg
1 foot = 12 inches
1 yard = 3 feet
1 mile = 1760 yards
1 pint = 20 fluid ounces
1 gallon = 8 pints
1 pound = 16 ounces
1 stone = 14 pounds
1 ton = 2240 pounds
A litre of water's a pint and three-quarters.
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Just when I thought I knew all of the imperial units I heard Matt Parker (Standup Maths) list them all, even the more obscure ones, in this wonderful monologue. When you hear their names and their relative sizes you cannot help but be grateful for the metric system which is more common today.
This audio excerpt is from an excellent podcast from BBC Radio 4 called More or Less: Behind the Stats in which Tim Harford tries to make sense of the statistics which surround us. It's well worth a listen if you have an interest in mathematics and statistics and provides real world examples of the maths we learn in school.