On January 29, 2015 Microsoft released versions of Word, Excel, and PowerPoint ported for Android tablets. The current system requirements for Office on Android tablet are: devices of screen sizes 7 inches or larger (a device with screen size greater than 10.1 inches will require an Office 365 subscription to create and edit), with an ARM based processor and 1 GB RAM or above. Today, the Android OS version that is supported is KitKat4.4.x. While you can use the apps on an Android tablet running Lollipop, it is not supported at this time but will be in a subsequent update.
Microsoft is also committed to supporting Android devices with Intel chips via a native implementation that will be available within a quarter.
When you use the apps for personal use, core editing is free and premium features require a qualifying Office 365 subscription. When used for commercial use, you need a qualifying Office 365 subscription for editing and premium features.
Please download Word, Excel and PowerPoint from the Google Play store.