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 11800 by the denominator 80 (which you can enter in any calculator):
11800 (numerator) ÷ 80 (denominator) = 147.5
And finally, you get 147.5 as your answer when you convert 147 40/80 (or 11800/80) to a decimal.