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The answer depends on the accuracy that is required. 1.2 metres instead of 1.21 metres will be OK for most purposes but if you are trying to fit a 1.21 metre object when the space available is 1.2 metres, you are in big trouble!

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7y ago
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6y ago

There are infinitely many possible answers and they depend on what operations are carried out using the number and what other numbers are involved. As a general rule, though, any number in the interval [11.5, 12.5) could be rounded to 12.

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Q: What fraction can be replaced with 1.2 when estimating?
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