Organize the lengths below from shortest to longest.28 dm 629,000 mm 1.2 km 30,277 cm

Convert each length to meters to compare them: 28 dm = 2.8 m, 30,277 cm = 302.77 m, 629,000 mm = 629 m, and 1.2 km = 1,200 m. From shortest to longest, these are 2.8 m, 302.77 m, 629 m, and 1,200 m. Therefore, the correct order is 28 dm, 30,277 cm, 629,000 mm, 1.2 km (choice D).

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