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, for example, 437 is a number in decimal form since
say if it was 37/100 it would be 0.37 because 100 has 2 zeros after the decimal point has to as well. If it was 199/1000 it would be 0.199
It already is in decimal form.
The number is already in decimal form!
The number in decimal form is 0.12.
This number already is in decimal form.
The number is already in decimal form!
2.09 is a decimal.
104 is a whole number and is not usually written in a decimal form.
1.59 is already in decimal form so you do nothing!
2.346
3.0
The number 7 can be written as 7.00 in hundredths decimal form.
It is a rational number, in decimal form. In the form of a ratio, it is 11/100.