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20 is an integer and so, as a fraction, it is still 20.

A decimal 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. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.

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Q: What is 20 as a decimal fraction?
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