A fraction is written in terms of two parts: the number on top is called the numerator and the number on the bottom is called the denominator. We can use the division method to solve this question. To get a decimal, simply divide the numerator 45 by the denominator 42:
45 (numerator) ÷ 42 (denominator) = 1.07
As a result, you get 1.07 as your answer when you convert 1 3/42 (or 45/42) to a decimal.