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A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the decimal representation of 800 is 800, exactly as in the question. However, if you msut have a decimal point you could write is as 800. but without any trailing zeros since they would imply a higher level of precision for which there is no justification.

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7y ago
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Q: How do you write 800 using decimal points?
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