Any fraction can be converted to a decimal by dividing the numerator by the denominator. You may have memorized several "decimal equivalents" for common fractions, so another approach is to convert the given fraction to a common fraction and then its "decimal equivalent".
18/81 = ? Since 18/81 = 2/9 and 2/9 = 0.2222..., then 18/81 = 0.2222... Easy steps!
54/60 = ? Since 54/60 = 9/10 and 9/10 = 0.9, then 54/60 = 0.9 Easy steps!
For each problem, convert the given fraction to a common fraction and then identify its "decimal equivalent". Strive for accuracy and then strive to increase your speed. Good luck and enjoy the challenge!