# mathematical operations with variables in KeywordTesting

Hi,

In my project I need to subtract two values to compare with another value.

My problem is how to subtract two values (or add, or any other simple mathematic function)

I have created two variables which store my values. And I need make an addition or subtraction and need to create a new variable for the result. After that I will compare the result with another variable for verification.

Which method or operation should I use? (I'm creating test cases with keyword tests)

Please can you help me on this issue.

Thank you.

Use Set Variable Value (lots of screenshots to follow)

**first pick your result variable out of the list****then Next and choose Code Expression, then select your first variable, enter a +, then select your second variable****You will end up with this****Click OK and then Finish and you will see this in your test**