Converts measurements among customary linear units—inch, foot, yard, and mile—using fixed equivalences such as 12 inches = 1 foot, 3 feet = 1 yard, and 5,280 feet = 1 mile. The learner interprets conversion as multiplying or dividing by a unit ratio that preserves length, works with whole-number and familiar fractional or decimal measures, and recognizes that larger units correspond to smaller numerical values; area, volume, metric units, and generalized dimensional analysis are outside this scope.
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