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Every measurement needs a value and standard unit. For example, if a person says that he is five four tall, the units are implied (if in the United States, it is generally understood that this is 5 feet and 4 inches, or 64 inches. Any measurements that are made, must include units. Also, this will help if any mathematical functions are performed with the measurements, as it will be evident if the answer is not in the correct dimension / unit. For example, when finding the time it takes, to travel a certain distance at a certain speed, do you divide by speed or multiply? If the units are kept, it will be evident that division is necessary for the units to come out so that the answer has the dimension of time.
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