To multiply two fractions, you must find the common denominator. The best way to do this is to multiply the denominators one by one. When you have found the common denominator, simplify the fraction and use the result to find the answer. You can also use the least common multiple (LCM) method. It will return the answer in the lowest form.
To solve this problem, you can use a calculator. It is helpful to compare fraction sizes and to use a hexadecimal chart to see how many decimal places the denominator needs to be the same. The fractions 5/16 and x/12 will be equivalent because they have the same denominator. However, fractions with different bottom numbers are not as easy to compare.