18 is already a decimal number. If you meant 1/8, then this is written in decimal notation as 0.125.
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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 required decimal representation is 18, exactly as in the question.
3/18 as a decimal = = 0.166673/18:= 3 ÷ 18= 0.16667 in decimal
If you mean 18/25 then it is 0.72 as a decimal
A decimal number is not an integer. An integer is a number that is not a fraction, and decimal numbers are decimal fractions.
As a fraction it is simply 18/1 and as a decimal it is simply 18.0