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 required decimal representation is 13, exactly as in the question.
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Expressed as a decimal, 13/5 is equal to 2.6.
Expressed as a decimal, 13 6/100 is equal to 13.06.
Expressed as a decimal, 6/13 is equal to 0.461538 recurring (that is, 0.461538461538...)
Expressed as a decimal, 13/80 is equal to 0.1625.
Expressed as a decimal fraction, 13 percent is equal to 13/100 = 0.13.