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rounding,  user error, the environment, the tool, the units you are using, precision and accuracy

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some matireals can expand and contract with different conditions.

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rounding

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mistakes by the person measuring, wrong rounding techniques, measuring with tools that aren't meant for the job.

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The surrounding area may change, affecting the accuracy of a measurement.

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your unit of measurement, which can become very long and confusing depending on how you convert it

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measureing in the wrong thing like meters instead of feet or just not reading your mesurement right

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Maybe dents, or sharp curves, or maybe the device you are using to measure the object.

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The unit of measurement or a mistake by the person measuring.

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The tool used to measure wearing down due to use

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weirdly shaped angles and curves

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User Error and rounding your answer

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The size of the object that is being measured/very small or very large object

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Precision and accuracy, guessing, bad rounding.

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The environment where the measurement is taking place.

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mistake by the person measuring and trying to guess a measurement instead of using a measuring tool can lead to uncertainty of a measurement.

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Some factors that might contribute to the uncertainty of a measurement may include the variability of the environment it is being tested in, rounding of the measurements, or user error in the tests.

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rounding to nearest integer, non-consistent units