Choosing appropriate customary units means matching the attribute and approximate magnitude of a quantity to units such as inches, feet, yards, miles; ounces, pounds, and tons; or cups, pints, quarts, and gallons. The understanding includes using familiar benchmarks, recognizing that equivalent units differ in size and precision, and selecting a sensible unit before measuring or estimating; specialized units, very large or very small quantities, and advanced dimensional analysis are not included.
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