To install Office on Android, we have two methods available: through Malavida, and through Google Play. Let's see them below.
How to install Office from Malavida
To install Office from Malavida, first, download the app from the green Download button at the end of this guide. Then, tap on the green button:

On the page we will arrive at, tap again on the green button and the download will start:

When the download is complete, open our preferred file manager (in our case Google Files) and tap on Downloads:

Now, tap on the Office APK file:

Android will ask us to confirm the installation. Tap on Install:

The app will be installed on the device:

When the installation is finished, tap on Open:

And we will already have Office installed in our device.
How to install Office from Google Play
Open Google Play and tap on the search bar:

Then, write office on it and tap on the magnifying glass icon on our keyboard:

Tap on the first result:

Now, on the Install button:

The application will be installed. When the installation is finished, tap on Open to open it:

Although this option seems more direct a priori, we strongly recommend you to manually install the app from trusted sources, like ours. Why? Because the latest versions of apps do not always reach Google Play first, while APK file repositories always have the updated versions.
Uninstalling Office
To uninstall Office, we have two options: from the phone, and from Google Play. To uninstall it from the phone, just go to the shortcut Android has created for the app, press long, and drag the icon slightly. At the top of the screen, you will see an option called Uninstall. We will have to drag it over there:

Uninstalling Office from Google Play is equally simple, although it does require some additional steps. For now, we will have to repeat the process we have already described, opening Google Play, and searching for the app again. When we get to the page of the application, tap on the Uninstall button:

You now have all the information you need to install and uninstall Office for Android without any problem.