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.
decimal form of 14/15 = 0.933314/15= 14 ÷ 15= 0.9333 in decimal
7/15 in decimal form = 0.4666...7/15:= 7 ÷ 15= 0.4666... in decimal
decimal form of 15 and 2 tenths = 15.2
15 over 8 in decimal form = 1.87515/8:= 15 ÷ 8= 1.875 in decimal
You do absolutely NOTHING! 15 is already in decimal form.
25/15 in decimal form is 1.66 repeating
It is: 15/100 = 0.15 as a decimal
15/200:= 15 ÷ 200= 0.075 in decimal
0.933314/15:= 11 ÷ 36= 0.9333 in decimal
15 over 2 as a decimal is 8.5
6/15:= 6 ÷ 15= 0.4 in decimal
1/15:= 1 ÷ 15= 0.0667 in decimal