How to delete all Excel files on MacBook Air?

Hi all,
I'm new to this forum and am posting a general question regarding how to delete multiple files. I've Googled it and not had any luck. I have a 2012 MacBook Air with OS Sierra that has Microsoft Excel and Word on it. I am planning to give it to my son but do not want any of my files in Excel or Word to be left on the computer as they are private. Can anyone tell me how to delete multiple files all at once? I have 124 files in Excel and was hoping to be able to delete them faster than one by one. I also hopefully want to keep the program on the computer so he can use it if he needs to later instead of just deleting the entire thing.

Thank you in advance and please be as specific in your instructions as possible as I'm a bit challenged technologically. Also, please let me know if whatever you tell me would work with deleting Microsoft Word documents too. Many thanks!

Thank you FDibbins and Frabulator, your suggestions worked quite well. Appreciate your quick reply and assistance! As I'm new to this forum, I'm not sure how to write problem solved, but it is. Thanks again!

Originally Posted by spdypd

Thank you FDibbins and Frabulator, your suggestions worked quite well. Appreciate your quick reply and assistance! As I'm new to this forum, I'm not sure how to write problem solved, but it is. Thanks again!

No problem, we are glad to help.

To mark a thread as resolved select it from the thread options menu at the top of your first post. I think its thread options anyway... I know its one of those menu options .

You can also add reputation to posts that were helpful. While this doesnt benefit future users like marking the thread as resolved it does help raise the reputation of the users that provided answers.