The decimal number 0.55 can be expressed as a fraction in its simplest form. This process involves converting the decimal into a fraction by placing the decimal part over the place value of the last digit. In this case, 0.55 can be written as 55/100. However, this fraction is not in its simplest form, as both the numerator and denominator share a common factor of 5.
To simplify the fraction, we divide both the numerator and the denominator by their greatest common divisor, which is 5. This results in 11/20. Thus, 0.55 as a fraction is 11/20.
This conversion is useful in various mathematical and real-world applications, such as representing measurements or performing calculations that require fractional values.