What's 30 Of 90?


Mathematics is an essential part of our daily lives. We use it to calculate our finances, make decisions, and even in our hobbies. However, not everyone is comfortable with math, and some find it challenging to understand certain concepts. In this article, we will explore the concept of percentages and answer the question, what’s 30 of 90?

Understanding Percentages

Before we dive into percentages, let’s briefly discuss fractions. A fraction is a way of representing a part of a whole. For example, 1/2 represents one out of two equal parts. Percentages, on the other hand, are a way of representing a part of a whole out of 100. For example, 50% represents fifty out of one hundred equal parts.

Calculating Percentages

To calculate a percentage, we need to know the part and the whole. In our case, the part is 30, and the whole is 90. To find out what’s 30 of 90 as a percentage, we use the following formula:

Percentage = (Part ÷ Whole) x 100

Substituting the values, we get:

Percentage = (30 ÷ 90) x 100

Simplifying, we get:

Percentage = 0.33 x 100

Therefore, 30 of 90 is 33.33%.

Uses of Percentages

Percentages are used in various fields, including finance, statistics, and science. They are used to compare data and make informed decisions. For example, if you are comparing the prices of two products, knowing the percentage difference can help you make a better decision.

Real-Life Example

Let’s say you are shopping for a new car, and you have two options. The first car costs $25,000, and the second car costs $30,000. To find out the percentage difference, we use the formula:

Percentage difference = [(Second value – First value) ÷ First value] x 100

Substituting the values, we get:

Percentage difference = [(30,000 – 25,000) ÷ 25,000] x 100

Simplifying, we get:

Percentage difference = 20%

Therefore, the second car costs 20% more than the first car.


In conclusion, percentages are a crucial concept in mathematics and everyday life. They are used to represent parts of a whole out of 100 and are used in various fields to make informed decisions. To find out what’s 30 of 90, we use the formula (Part ÷ Whole) x 100, which gives us a percentage of 33.33%. Now that you understand percentages, you can use them in your daily life to make better decisions.