The primary difference between metric and imperial measurements is that the metric system is based on units of 10 (ex. 10, 100, 1000, 1/100, 1/1000 etc.) while the imperial system is primarily based on 1/2s (ex. 1/2, 1/4, 1/8 etc.) although there are some exceptions to the imperial system, such as there are 12 inches in a foot. The imperial system originates from the Roman Army, where the measurement of a mile came from a combination of the measurement of a Roman soldier's sandaled foot, and the Latin 'mille passus' which translates to 1000 paces.
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