The value (magnitude) of integer number 15 is the same as the real (decimal) number 15.0
0.15 is a decimal number which is equal to 15/100ths
It is simply -19.0 as a negative decimal number
15 = 1111
15*49100 = 736500.
The binary number 1111 = 15
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. If it does not contain a fractional part then the decimal representation does not require a decimal point. So the decimal for 15 is 15 - as in the question.
To convert a whole number to a decimal, place a decimal point at the end and place a zero.15 -> 15.0125 -> 125.01454874 -> 1454874.0
If its a fraction such as 3/4 then divide the denominator into the numerator which as a decimal is 0.75 but if its a whole number such as 15 then simply add .0 to the end of it and so 15 as a decimal is 15.0