In this intro to decimals lesson, you'll get to fully understand them before adding, subtracting, multiplying, dividing, and converting them.

### What are decimals?

A **decimal **is another way to write a **fraction**. You can think of a decimal as a **part** of a **whole number**. It is **less** than **1** whole thing, but more than **0**.

You may not realize it, but you see decimals a lot in real life. One of the most common examples is money.

Do you recognize these coins? We have a **quarter**, a **dime**, and two **pennies**. You could write each of these as a decimal. That's because each coin is worth **less than a whole dollar**.

Click through the slideshow to learn how decimals work.

This is a dollar. A dollar represents a **whole** number. It is equal to 1.

We could also write that as 1.00. In other words, 1 = 1.00.

1.00 is a **decimal**. Here, it means we have 1 dollar and 0 cents.

As you may already know, there are 100 pennies in a dollar. This means 100 pennies equals 1.00.

One penny is **part** of a dollar. More specifically, it's 1 cent. We could also write that as a decimal: 0.01.

Let's look at a few more decimals. 9 cents is 0.09 of a dollar.

A quarter, or 25 cents, is 0.25 of a dollar. Any time you have part of a whole, you can write it as a decimal.

Let's look at another example. This pitcher holds 1 liter of water. Right now it's full.

We could write this as a decimal: 1.00 liters.

The pitcher is split into **10** **parts**. This means each part is equal to 0.10 liters.

As the day goes on, the pitcher gets emptier. Now it has 0.70 liters. That's because we used up 0.30 liters.

Now it has 0.50 liters, or **half** a liter.

Now it has 0.20 liters. Even though we have **less than **one liter, we have **more than zero** liters, so we can write it as a **decimal**.