7- 79over 100
You go to a teacher and ask them how to do it. These punks are not going to tell you the right things about your question.
7 79/100
Write the decimal fraction as a fraction and reduce if possible. (It's the same as what you do when you write a check for $7.79.)
7.79 miles = 7 79/100 miles
79/100 cannot be reduced because 79 and 100 have no common factors.
7.79 miles = 7 79/100 miles
79/100 cannot be reduced because 79 and 100 have no common factors.