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Use 3 different units of length with the number 12?
12 feet 12 inches 12 centimeters 12 meters 12 yards 12 miles 12 kilometers
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Why use different units of measurement?
if you used Milimetres to measure a Football pitch it would take Years so you would you something more sensible and higher (Kilometres)
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What is the definition of length and the units it uses?
In the International System (SI), a length or distance is measured in meters, or some multiple like km., mm., etc.
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What units are use to measure length?
The SI unit is metres.
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What units do you use to measure length?
In the Metric system, you use the meter (or kilometer, millimeter, etc.). In other systems, you can use miles, feet, inches, or light-years.