how do you write a fraction as a mixed number

If it is a improper fraction just divide the numerator by the denominator and then the remainder is the numerator again with the same denominator. 

Example: 5/4 divide 5 by 4. It will go into it 1 time and you will have 1 left over. Then use the denominator of the beginning fraction. So the answer would be 1 1/5