Have you ever found yourself needing to quickly figure out **what is 20 of 90**? Whether you’re splitting a restaurant bill, calculating a tip, or determining a discount on a purchase, knowing how to easily find **20% of 90** is a valuable skill. Let’s walk through how to solve this common math problem step-by-step.

## Breaking Down the Calculation

To find **20 percent of 90**, we’ll use a simple formula. In general terms, here’s how it works:

*[Percentage] x [Number] = [Result]*

In this case, our percentage is 20% and our number is 90. So plugging those into the formula, we get:

*20% x 90 = Result*

### Converting the Percentage to a Decimal

The first step is to convert 20% to a **decimal**. To do this, simply move the decimal point in 20 two spaces to the left, which gives us 0.20.

So now our formula looks like this:

*0.20 x 90 = Result*

### Multiplying the Decimal by the Number

Now that we have our **percentage as a decimal**, we can multiply it by our original number, 90. Let’s solve the equation:

*0.20 x 90 = 18*

And there we have it – **20% of 90 equals 18**. So if you’re at a restaurant and your bill is $90, a 20 percent tip would be $18. Or if an item normally costs $90 but is 20% off, you’ll save $18.

## A Few More Examples and Tips

Once you understand the basic **formula** for finding a percentage of a number, you can use it for all sorts of applications. Need to calculate **15% of 50**? Simply convert 15% to 0.15 and multiply it by 50 to get 7.5.

Want to find **7.5% of 160**? Change 7.5% to 0.075 and multiply it by 160 for a result of 12. With a little practice, you’ll soon be able to quickly estimate percentages in your head.

Percentages come up surprisingly often in daily life. Sales tax, interest rates, poll results – **knowing how to find a percentage of a given number** lets you make sense of them all. So the next time you see a **statistic** like “37% of people prefer chocolate ice cream,” you’ll be able to easily figure out how many people that actually represents based on the sample size.

## Exploring the Concept Further

Figuring out **what 20% of 90** is may seem like basic math, but it opens the door to more complex concepts. Once you’re comfortable calculating percentages, you can start to understand ideas like **percentage change** over time, or even use **algebraic equations** to find the original number when given a percentage and result.

But for most everyday situations, simply remembering the formula *Percentage x Number = Result* will let you find **what is 20 of 90** or any other percentage problem that comes your way. With this handy skill in your mathematical toolkit, you’ll be able to quickly calculate discounts, taxes, and tips – impressing your friends and making numbers just a little less intimidating.

So go ahead, embrace your inner **math whiz**. The next time you encounter a percentage in the wild, you’ll know exactly what to do. Happy calculating!