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 58 by the denominator 37 (which you can enter in any calculator):
58 (numerator) ÷ 37 (denominator) = 1.57
And finally, you get 1.57 as your answer when you convert 1 21/37 (or 58/37) to a decimal.