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 84 by the denominator 25 (which you can enter in any calculator):
84 (numerator) ÷ 25 (denominator) = 3.36
And finally, you get 3.36 as your answer when you convert 2 34/25 (or 84/25) to a decimal.