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Year 5 is an educational year group in schools in many countries including England, Wales, Australia and New Zealand. It is usually the fifth year of compulsory education and incorporates students aged between nine and eleven.
A section can be halved seven times in this way, down to a 5-acre (2 ha) parcel, or half of a quarter-quarter-quarter section—an easily surveyed 50-square-chain (2 ha) area. This system was of great practical value on the American frontier, where surveyors often had a shaky grasp of mathematics and were required to work quickly.