Now that we know how to set up problems with decimals, let's practice by solving a few. First, we'll work on **adding**. If you feel comfortable adding larger numbers, you're ready to add decimal numbers.

Click through the slideshow to learn how to add decimals.

Let's try solving this problem: 1.9 + 2.15.

First, we'll make sure the decimals are lined up.

We'll start by adding the digits farthest to the **right**. In this case, we have nothing on top and 5 on the bottom.

Nothing plus 5 equals 5. We'll write 5 beneath the line.

Now we'll add the next set of digits to the** left**: 9 and 1.

9 + 1 equals 10, but there's no room to write both digits in 10 underneath the 9 and 1. We'll have to **carry**.

We learned how to carry numbers in the lesson on Adding Two- and Three-Digit Numbers.

We'll write the right digit, 0, **under** the line...

We'll write the right digit, 0, **under** the line...then we'll carry the left digit, 1, up to the **next** set of digits in the problem.

Now we'll write the decimal point. We'll place it directly **beneath** the other two decimal points.

Next, we'll move **left** to add the next set of digits: 1 and 2. Since we carried the 1, we'll add it too.

1 + 1 + 2 equals 4. We'll write 4 below the line.

We're done. 1.9 + 2.15 = 4.05. We can read this answer as **four and five-hundredths**.

Let's try it with a money problem: $51.99 + $25.32.

We'll make sure our decimal points are lined up properly.

As always, we'll start by adding the digits on the right. Here, that's 9 and 2.

9 + 2 equals 11, so it looks like we'll have to** carry**.

The 1 on the **right** stays underneath the 9 and the 2.

We'll carry the 1 on the** left** and place it above the **next** set of digits to the left.

Now we'll move **left** to add the next set of digits. Since we carried the 1, we'll add it too.

1 + 9 + 3 = 13.

We'll put the 3 **under** the digits we added.

We'll carry the 1 and place it **above** the next column to the left.

Now it's time to write the decimal point. Remember to place it directly **beneath** the other two decimal points.

Next, we'll move **left** and add the next set of digits. We'll make sure to add the 1 we carried.

1 + 1 + 5 = 7. We'll write 7 beneath the line.

To finish, we'll add the next column to the **left:** 5 and 2.

5 + 2 equals 7. We'll write 7 underneath the 2.

We'll finish by writing the **dollar sign** ($).

We're done. $51.99 + $25.32 = $77.31. We can read this answer as **seventy-seven dollars and thirty-one cents**.

Try solving these problems to practice adding decimal numbers.