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All measurements are approximate. Measurements are given to the nearest practical unit, like a cm or mm or gram. There is then a group of...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eUpper \u0026 Lower Bounds | Number | Maths | FuseSchool In this video we discover what bounds. All measurements are approximate. Measurements are given to the nearest practical unit, like a cm or mm or gram. There is then a group of numbers that the original measurement is somewhere between. This is the limits of accuracy. There is a largest possible number called the upper bound. And a lowest possible number called the lower bound. Some people find it very easy to just visualise what the bounds of a measurement are. But there is also a simple method we can use: half the degree of accuracy, and then add or subtract this from the rounded value to get the upper and lower bounds. 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