Imperial UnitsLearn about common imperial units and how they relate to other units of measurement 
Ton was standardised in the 13th century and should not be confused with the metric tonne that has a different spelling.
Stone derives from the use of stones for weights, a practice that dates back into antiquity
Pound is descended from the Roman libra (hence the abbreviation lb). The English word pound is derived from German Pfund, Dutch pond, and Swedish pund.
Ounce derived almost unchanged from the uncia, an ancient Roman unit of measurement.
1 ton = 160 stones1 stone = 14 pounds1 pound = 16 ounces
This is level 2: units of weight. You will be awarded a trophy if you get at least 14 correct and you do this activity online.
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❎Level 1  Units of length
Level 2  Units of weight
Level 3  Units of capacity
Exam Style Questions  A collection of problems in the style of GCSE or IB/Alevel exam paper questions (worked solutions are available for Transum subscribers).
More on this topic including lesson Starters, visual aids, investigations and selfmarking exercises.
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See the National Curriculum page for links to related online activities and resources.
1 mile = 1760 yards1 yard = 3 feet1 foot = 12 inches
1 ton = 160 stones1 stone = 14 pounds1 pound = 16 ounces
1 gallon = 4 quarts1 quart = 2 pints1 pint = 20 fluid ounces
The sign ≈ means approximately equal to.
1 inch ≈ 2.5cm
5 miles ≈ 8 km
2.2 lb (pounds) ≈ 1kg
1.75 pints ≈ 1 litre
1 gallon ≈ 4.5 litres
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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.
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