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. 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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That IS the decimal form.
It is in decimal form!
You write fourteen and three tenths in decimal form as: 14.3
0.09 IS in decimal form.
It is already in decimal form.