Convert fractions to ratios quiz online. Ratios express a relationship between numbers or quantities of objects. The expression of ratios makes use of a column sign in between numbers. For example, 2 : 3 read as two is to three. When converting this ratio to a fraction value, first add both numbers to get the sum. In the example, 2 plus 3 equals 5. Hence the expression in fractions is as follows: 2/5. Students often make the mistake of expressing it as 2/3. Get the trick and solve all the problems in this MCQ. This exercise on converting ratios to fractions is for children in 3rd, 4th, 5th and 6th grades.