Adding and Subtracting Decimals

Learn all about adding decimals and subtracting decimals in this free basic math lesson.

Adding and subtracting with decimals

Adding and subtracting decimals happens a lot in real life. You may find that you need to add up the cost of your groceries to see if you have enough money to pay for them. Or perhaps you need to subtract the cost of a bill from your bank account.

When you're adding or subtracting decimal numbers, it's important to set up the expression correctly. The numbers need to be in a certain place, and so do the decimals.

Click through the slideshow below to learn how to set up these expressions.


Adding decimal numbers

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.

Try This!

Try solving these problems to practice adding decimal numbers.

12.20 + 12.20 =
5.40 + 45.80 =
3.85 + 9.67 =

Subtracting Decimal Numbers

On the previous page, you saw that adding numbers with decimals is a lot like adding other numbers. The same is true for subtracting numbers with decimals. If you can subtract large numbers, you can subtract numbers with decimals too!

Click through the slideshow to learn how to subtract decimals.

Try This!

Try solving these problems to practice subtracting decimal numbers.

5.85 - 2.73 =
84.50 - 2.30 =
99.90 - 67.40 =

Assessment

Want even more practice? Try out a short assessment to test your skills by clicking the link below:

Start Assessment