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. It may or may not contain a fractional part. If not, the decimal representation does not require a decimal point. So the decimal for 305 is 305!
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305 is in decimal form. It is not necessary to add a decimal point and zeros to whole numbers
30.5 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 305/10 which can be simplified to 61/2.
3.05 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 305/100. You can simplify this rational fraction if you so wish.
1.2 is equivalent to 1.20.
To write 1.30 as a decimal form, you can simply drop the trailing zero after the decimal point. Therefore, 1.30 is equivalent to 1.3 in decimal form.
0.4 is already expressed in decimal form. It is equivalent to 4/10 or four tenths.