Fraction is one of the clearest way to represent the result. However, the situation may not always be ideal to use fraction. For example, fraction might be more complex to write in computer, it takes more space overall in the paper, and it might not be as good as others in terms of representing statistics. Due to these disadvantages, people often adopt the uses of decimals, percents and ratios instead. Thus learning to convert between such units is a fundamental skill to acquire for mathematics mastery. This collection is prepared with such converting question for students to practice.