13.0
Answer "13" is a decimal value IF by "13" you mean 13 in our base-10 numbering system. In this system, the 3 in 13 stands for 3 units, and the 1 in 13 stands for 1 ten. Combining the 1 ten and the 3 units gives 10 + 3 = 13. We also say that 13 is a decimal value because it contains no nondecimal (non-base-10) fractional parts. You could write 13 as 13.0 if you wish. Whole numbers in our base-10/decimal system are always decimal values, by definition. Examples:
13 1/4 is not a decimal value; 13.25 is.
13 2/10 is a decimal value, actually, but not in a decimal representation.
13.2 means the same thing as 13 2/10, but in a decimal representation.
13 1/3 cannot be represented as a pure decimal; it equals 13.3333... (etc.)
"13" could be a number representation of a value in a number system other than base 10. For example, 13 is a value in the hexadecimal (base 16) number system. 13 hex = (1x16)+(3x1) = 19.
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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.