A fraction is usually split into two parts: the first part is the number on top, called the numerator; and the second part is the number on the bottom, called the denominator. These are both separated by a line called the “divisor line”. We can use the division method help to solve this question: to get a decimal, simply divide the numerator 97 by the denominator 7 (which you can enter in any calculator):
97 (numerator) ÷ 7 (denominator) = 13.86
And finally, you get 13.86 as your answer when you convert 12 13/7 (or 97/7) to a decimal.